San Bernardino, California, massacre suspects could have terror links

Do Not Know Motive: LA FBI Director

Grim details emerged Thursday about a massacre at a California holiday party that left 14 people dead and 21 more hurt, but investigators are still trying to answer the key question: Why?

The couple who unleashed the bloodbath Wednesday fired as many as 75 rounds at the Inland Regional Center in San Bernardino, and tried to slaughter more with a rigged pipe bomb that never detonated, authorities said Thursday.

American-born Syed Rizwan Farook, 28, and wife Tashfeen Malik, 27, were killed in a shootout with police more than four hours after the initial rampage. The couple -- clad in black tactical gear but no bulletproof vests -- fired another 76 rifle rounds during a pursuit with police, San Bernardino Police Chief Jarrod Burguan told reporters.

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San Bernardino, California, massacre suspects could have terror links
REDLANDS, CA - DECEMBER 2: A SWAT team member stands watch with a rifle pointed at a home being investigated by police is shown after a mass shooting at the Inland Regional Center in San Bernardino December 2, 2105 in Redlands, California. Multiple fatalities and injuries were reported in the shooting (Photo by Marcus Yam/Los Angeles Times via Getty Images)
Law enforcement officers investigate a suspicious bag, later found not to be a threat, on Victoria Avenue after a mass shooting at the Inland Regional Center on Wednesday, December 2, 2015 in San Bernardino, California. At least 14 people were killed in a gun attack on a holiday party, triggering a massive manhunt that ended when police shot dead two heavily armed suspects -- a man and a woman -- on a quiet residential street. AFP PHOTO / PATRICK T. FALLON / AFP / Patrick T. Fallon (Photo credit should read PATRICK T. FALLON/AFP/Getty Images)
SAN BERNARDINO, USA - DECEMBER 02: Yellow stripe is seen as the US Security Forces secure the area following a shooting that killed multiple people at a social services center for the disabled in San Bernardino, California of United States on December 02, 2015. Two suspects in a deadly mass shooting that killed 14 victims at a social services facility in California were killed after a confrontation with police, authorities said Wednesday. The initial shooting occurred earlier Wednesday when at least one shooter opened fire in San Bernardino at the Inland Regional Center, which provides services to persons with developmental disabilities and their families. At least 17 others were injured. (Photo by Mintaha Neslihan Eroglu/Anadolu Agency/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: A police officer officer guards a police line as officers prepare to raid the home of one or more suspects of a mass shooting at the Inland Regional Center by multiple gunmen on December 2, 2015 near San Bernardino, California. Police continue to investigate the shooting that left at least 14 people dead and another 17 injured. (Photo by David McNew/Getty Images)
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SAN BERNARDINO, CA - DECEMBER 2: Police place a marker along E. San Bernardino Ave. where a shootout occurred December 2, 2015 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for suspects still at large. (Photo by Rick Loomis/Los Angeles Times via Getty Images)
Armed police personnel walk along closed off streets in the San Bernardino neighborhood near the intersection of Richardson and Gould where a house was searched on December 2, 2015. A man and a woman suspected of carrying out a deadly shooting at a center for the disabled in California were killed in a shootout with police, while a third person was detained, police said. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: A police helicopter circles as officers search for a possible suspect following a shootout with suspects of a mass shooting at the Inland Regional Center by multiple gunmen on December 2, 2015 in San Bernardino, California. Police continue to investigate the shooting that left at least 14 people dead and another 17 injured. (Photo by David McNew/Getty Images)
Law enforcement officers search for the suspects of a mass shooting December 2, 2015 in San Bernardino, California. A man and a woman suspected of carrying out a deadly shooting at a center for the disabled were killed in a shootout with police, while a third person was detained, police said. AFP PHOTO / PATRICK T. FALLON / AFP / Patrick T. Fallon (Photo credit should read PATRICK T. FALLON/AFP/Getty Images)
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Law enforcement officers search for the suspects of a mass shooting December 2, 2015 in San Bernardino, California. A man and a woman suspected of carrying out a deadly shooting at a center for the disabled were killed in a shootout with police, while a third person was detained, police said. AFP PHOTO / PATRICK T. FALLON / AFP / Patrick T. Fallon (Photo credit should read PATRICK T. FALLON/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: A SWAT unit mobilizes near Richardson Street after a mass shooting at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at-large. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Law enforcement officers search for a possible suspect following a shootout with suspects of a mass shooting at the Inland Regional Center by multiple gunmen on December 2, 2015 in San Bernardino, California. Numerous deaths and injuries have been reported. (Photo by David McNew/Getty Images)
Law enforcement officers search for the suspects of a mass shooting December 2, 2015 in San Bernardino, California. A man and a woman suspected of carrying out a deadly shooting at a center for the disabled were killed in a shootout with police, while a third person was detained, police said. AFP PHOTO / PATRICK T. FALLON / AFP / Patrick T. Fallon (Photo credit should read PATRICK T. FALLON/AFP/Getty Images)
SAN BERNARDINA, CA - DECEMBER 2: A search team goes door-to-door looking for the third suspect in a residential neighborhood after a mass shooting at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at-large. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 02: A California Highway Patrol officer stands with his weapon as authorities pursued the suspects in a shooting that occurred at the Inland Regional Center on December 2, 2015 in San Bernardino, California. Police continue to search for suspects in the shooting that left at least 14 people dead and another 17 injured. (Photo by Sean M. Haffey/Getty Images)
SAN BERNARDINO, CA - DECEMBER 02: A California Highway Patrol officer stands with his weapon as authorities pursued the suspects in a shooting that occurred at the Inland Regional Center on December 2, 2015 in San Bernardino, California. Police continue to search for suspects in the shooting that left at least 14 people dead and another 17 injured. (Photo by Sean M. Haffey/Getty Images)
SAN BERNARDINO, CA - DECEMBER 02: A San Bernadino Sheriff helicopter flys above a neighborhood as authorities pursue suspects of the shooting at the Inland Regional Center on December 2, 2015 in San Bernardino, California. Police continue to search for suspects in the shooting that left at least 14 people dead and another 17 injured. (Photo by Sean M. Haffey/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Officers swarm San bernardino Ave at Richardson Street near where suspects were shot in a black SUV December 2, 2015 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for suspects still at large. (Photo by Irfan Khan/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Ambulances leave the scene of a mass shooting at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at-large. (Photo by Gina Ferazzi / Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Police draw guns on San Bernardino Avenue while chasing suspects in an SUV December 2, 2015 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for suspects still at large. (Photo by Francine Orr/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Police draw guns on San Bernardino Avenue while chasing suspects in an SUV December 2, 2015 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for suspects still at large. (Photo by Francine Orr/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Police and emergency vehicles line Waterman Avenue in front of the Inland Regional Center in San Bernardino, scene of a mass shooting on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at large. (Photo by Luis Sinco/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Police and emergency vehicles line Waterman Avenue in front of the Inland Regional Center in San Bernardino, scene of a mass shooting on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at large. (Photo by Luis Sinco/Los Angeles Times via Getty Images)
Police at the scene of a shooting on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 02: Members of the FBI Joint Terrorism Task Force stand outside of a press conference regarding the shooting that occurred at the Inland Regional Center on December 2, 2015 in San Bernardino, California. Multiple fatalities were reported as police search for up to three suspects who are still at large. (Photo by Sean M. Haffey/Getty Images)
SAN BERNARDINO, CA - DECEMBER 02: Ambulances pull out of a staging area near the Inland Regional Center where a shooting occurred earlier in the day on December 2, 2015 in San Bernardino, California. Multiple fatalities were reported as police search for up to three suspects who are still at large. (Photo by Sean M. Haffey/Getty Images)
A heavily armed officer sets up a perimeter near the site of a shooting that took place on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: San Bernardino County Sheriffs deputies respond to a mass shooting at the Inland Regional Center December 2, 2015 in San Bernardino, California. Multiple fatalities were reported as police search for up to three suspects who are still at large. (Photo by David McNew/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: A San Bernardino County Sheriffs Department investigator responds to a mass shooting at the Inland Regional Center December 2, 2015 in San Bernardino, California. Multiple fatalities were reported as police search for up to three suspects who are still at large. (Photo by David McNew/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Employees and other people are evacuated by bus from the site of a mass shooting at the Inland Regional Center December 2, 2015 in San Bernardino, California. Multiple fatalities were reported as police search for up to three suspects who are still at large. (Photo by David McNew/Getty Images)
Police escort civilians away from the 1300 block of S. Waterman Street near the site of a shooting took place on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
Police escort civilians away from the 1300 block of S. Waterman Street near the site of a shooting took place on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
Armed Sheriff's department personel man a roadblock at Waterman Street near the site of a shooting took place on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Police and fire personnel secure the scene where a mass shooting occurred at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at large. (Photo by Gina Ferazzi / Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: San Bernardino police offices in SWAT gear secure the scene where a mass shooting occurred at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at large. (Photo by Gina Ferazzi / Los Angeles Times via Getty Images)
A crowd gathers behind police line near the scene of a shooting on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
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Authorities said they are still trying to determine why Farook and his wife attacked the social services center.

"We do not know the motive ... it would be irresponsible of me and be way too early to speculate on motive," said David Bowdich, the assistant director in charge of the FBI in Los Angeles.

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"There was obviously a mission here," Bowdich said. "We do not know why. We do not know if this was the intended target or something triggered him."

Authorities told NBC News on Thursday that Farook appeared to have been radicalized. They said he had been in touch with people in the Los Angeles area who have expressed jihadist-oriented views.

Intelligence sources told NBC News that Farook appeared to have been in some form of communication with overseas individuals who are persons of interest to American authorities.

Farook and Malik had two assault rifles and two semi-automatic handguns that were legally purchased and registered, Burguan said.

In total, the pair had over 1,400 .223 caliber rounds available to them and over 200 9mm rounds on them during the gunbattle. The three pipe bombs were stitched together on a remote control car found at the scene, he added.

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San Bernardino, California, massacre suspects could have terror links
SAN BERNARDINO, CA - DECEMBER 3: A local outreach group prays with residents near the scene of an investigation where two suspects were gunned down during a shootout with police, December 3, 2015 in San Bernardino, California. A day earlier, the two suspects allegedly shot and killed 14 people at the Inland Regional Center in San Bernardino. (Photo by Gina Ferazzi/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 3: Redondo Police Officer Dan Richey carries a bouquet of flowers to deliver to a female shooting victim that grew up in Redondo Beach at the Arrowhead Regional Medical Center on December 3, 2015 in San Bernardino, California.A day earlier, the two suspects allegedly shot and killed 14 people and injured over 20 at the Inland Regional Center in San Bernardino. (Photo by Gina Ferazzi/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 03: A mourner cries as she brings flowers to a road block outside of the Inland Regional Center on December 3, 2015 in San Bernardino, California. Police continue to investigate a mass shooting at the Center that left at least 14 people dead and another 17 injured. (Photo by Justin Sullivan/Getty Images)
A woman identified as the fiancée of shooting victim (C-purple) is comforted by friends and Chaplain Steve Ballinger (L) as she leaves flowers on December 3, 2015, near the site of a mass shooting at the Inland Regional Center where 14 people were killed on December 2 in San Bernardino, California. Ballinger said the woman's fiancé died in the attack. AFP PHOTO/PATRICK T. FALLON / AFP / Patrick T. Fallon (Photo credit should read PATRICK T. FALLON/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 3: Larry Jones, pastor of Cross over Outreach Church, Dr. Jeannetta Million, pastor of Victoria's Believers Church, and Arnold Morales, pastor of King of Glory Church bow their heads in prayers for the victims and those involved in the mass shootings at the Inland Regional Center, during a prayer vigil at Orange Show Road and Waterman Avenue December 3, 2015 in San Bernardino, California. Investigators are looking for a motive as to why Syed Rizwan Farook and Tashfeen Malik went on a shooting rampage that left 14 dead and at least 17 others wounded. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 3: Local resident Katrina Venegas is close to tears as she has been kept away from her home which is directly in front of shooting scene where 2 suspects were gunned down driving a black SUV during a shootout with police on San Bernardino Avenue the day after the suspects allegedly shot and killed 14 people at the Inland Regional Center on December 3, 2015 in San Bernardino, California. She said her dog has been locked in the house alone since yesterday. (Photo by Gina Ferazzi/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 3: San Bernardino resident Lisa Gonzalez hugs Pastor Ernie Ceballos after he was helpful in getting the police to escort her back to her home on the same street where sheriff deputies investigate the scene where 2 suspects were gunned down during a shootout with police on San Bernardino Avenue the day after the suspects allegedly shot and killed 14 people at the Inland Regional Center on December 3, 2015 in San Bernardino, California. Gonzalez had left home briefly yesterday to go buy milk for her twin 3-year-olds. The shooting took place in front of her house while she was gone. She and her son, Santana Gonzalez,left, were not allowed back to their home so they spent the night in a hotel. Her husband was home with the children and wasn't allowed to leave the home. (Photo by Gina Ferazzi/Los Angeles Times via Getty Images)
SAN BERNARDINA, CA - DECEMBER 2: Olivia Navarro waits to see her daughter after a mass shooting at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at-large. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 03: A group of men embrace in prayer outside the crime scene where the suspects in the shooting at the Inland Resource Center were killed on December 3, 2015 in San Bernardino, California. Police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 17 injured. (Photo by Sean M. Haffey/Getty Images)
SAN BERNARDINO, CA - DECEMBER 02: Mayor of San Bernadino, California R. Carey Davis pauses during a press conference at City Hall regarding the shooting that took place inside the Inland Regional Center on December 2, 2015 in San Bernardino, California. Police continue to investigate the shooting that left at least 14 people dead and another 17 injured. (Photo by Sean M. Haffey/Getty Images)
SAN BERNARDINO, CA - DECEMBER 02: Mayor of San Bernadino, California R. Carey Davis speaks during a press conference at City Hall regarding the shooting that took place inside the Inland Regional Center on December 2, 2015 in San Bernardino, California.Police continue to investigate the shooting that left at least 14 people dead and another 17 injured. (Photo by Sean M. Haffey/Getty Images)
Omar Riopedre embraces his wife Diana, who was in the Inland Regional Center when the mass shootings took place, as they leave the Rudy C. Hernandez Community Center in the San Bernardino on December 2, 2015. A man and a woman suspected of carrying out a deadly shooting at a center for the disabled in California were killed in a shootout with police, while a third person was detained, police said. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
SAN BERNARDINA, CA - DECEMBER 2: Luis Gutierrez gets emotional as he talks about his wife after a mass shooting at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at-large. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Marie Cabrera, Sonya Gonzalez and Christine Duran, all of San Bernardino, pray after a mass shooting at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at-large. (Photo by Rick Loomis/Los Angeles Times via Getty Images)
People evacuated from the Inland Regional Center walk from busses into The Rock Church and World Outreach Center during the aftermath of a mass shooting at the facility on December 2, 2015 in San Bernardino, California. One or more gunmen opened fire inside a center for the disabled in killing at least 14 people and wounding the same number before fleeing the scene, officials said. AFP PHOTO / PATRICK T. FALLON / AFP / Patrick T. Fallon (Photo credit should read PATRICK T. FALLON/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Employees and other people are evacuated by bus from the site of a mass shooting at the Inland Regional Center December 2, 2015 in San Bernardino, California. Multiple fatalities were reported as police search for up to 3 suspects who are still at large. (Photo by David McNew/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Employees and other people are evacuated by bus from the site of a mass shooting at the Inland Regional Center December 2, 2015 in San Bernardino, California. Multiple fatalities were reported as police search for up to three suspects who are still at large. (Photo by David McNew/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: Employees and other people are evacuated by bus from the site of a mass shooting at the Inland Regional Center December 2, 2015 in San Bernardino, California. Multiple fatalities were reported as police search for up to three suspects who are still at large. (Photo by David McNew/Getty Images)
Police escort civilians away from the 1300 block of S. Waterman Street near the site of a shooting took place on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
Survivors are evacuated from the scene of a shooting on December 2, 2015 in San Bernardino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
Survivors are evacuated from the scene of a shooting under police and sheriff's escort on December 2, 2015 in San Bernadino, California. One or more gunman opened fire inside a building in San Bernardino in California, with reports of 20 victims at a center that provides services for the disabled. Police were still hunting for the shooter, saying one to three possible suspects were involved. Heavily armed SWAT teams, firefighters and ambulances swarmed the scene, located about an hour east of Los Angeles, as police warned residents away. AFP PHOTO / FREDERIC J. BROWN / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 2, 2015: Evacuated workers pray in a circle on the San Bernardino Golf Course across the street where a mass shooting occurred at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at large. (Photo by Gina Ferazzi / Los Angeles Times via Getty Images)
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A subsequent search of a home connected with the couple turned up 12 pipe bomb-type devices and a cache of weapons ammunition, Burguan said. Those include 2,000 9mm rounds, 2,500 .233 caliber rounds and several hundred .22 Long rifle rounds.

Farook had attended the Christmas party on Wednesday morning, but left about 15 to 30 minutes before the shooting began. Police said they received information by someone who was concerned about his behavior at the event.

Investigators say they know little about Malik or "where she is from."

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Federal officials told NBC News that Farook traveled to Saudi Arabia two years ago. Authorities believe, based on the timing, that the trip was for the hajj, the pilgrimage that devout Muslims are required to do at one point in their lives. The officials believe Farook met Malik there, and then brought her back to the U.S.

The couple left their 6-month-old daughter with her grandmother before the onslaught.

Farhan Khan told NBC News that his brother-in-law Farook and wife left their baby girl with Farook's mother on Wednesday, claiming they they had a doctor's appointment. The grandparents first became worried when they got a call from the media at around 2 p.m. asking if they knew Farook was a suspect in the shooting, according to Khan, who is married to Farook's sister.

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Malik was a naturalized Pakistani-American citizen who arrived in the U.S. on a K-1 or fiancee visa. She achieved American citizenship by virtue of her marriage to Farook two years ago.

"I just cannot express how sad I am for what happened today," Khan said at a news conference held by the Muslim advocacy group, the Council on American-Islamic Relations, on Wednesday night. "I am in shock that something like this could happen."

Khan said he had spoke to Farook a week ago, adding: "Why would he do something like this?" He added that Farook and Malik had been married for about two years.

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A profile under the user name "farooksyed49" on dating website iMilap.com featured a picture of Farook that Khan confirmed was his brother-in-law. It stated that the user was Muslim American and born in Chicago, Illinois.

"Farooksyed49" described himself as a Muslim American citizen looking for marriage who lives in "California/riverside" -- a community about 11 miles south of San Bernardino. His age on the site is listed as 22. IMilap.com describes itself as a "Site for People with Disabilities and Second Marriage."

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The user said he was from a "religious but modern family" and listed "Eastern and Western Mix" under family values.

"Enjoy working on vintage and modern cars, read religious books, enjoy eating out sometimes travel and just hang out in back yard doing target practice with younger sister and friends," according to the profile.

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NBC News could not immediately confirm whether the dating profile belonged to the suspect.

San Bernardino Mayor Carey Davis told TODAY's Matt Lauer of his "shock" at the events.

"The priority has been public safety. Our police department responded as effectively and safely as they could," he said. "We need to stay on a high level of alert but at the same time we can't be paralyzed by these instances."

Salihin Kondoker, whose wife was shot during the rampage, told TODAY that his son first learned of her involvement when a friend saw television pictures of her being treated at a local hospital.

Kondoker said she was recovering from gun wounds to her right arm.

"She's doing remarkably well," he said. "She said bullets were flying all over the place. She corralled herself into the bathroom but realized her hands were bleeding."

He added: "Any killing of a human being should be an act of terrorism. I think we need to control our gun law in this country. No matter what, any killing of any human being is an act of terrorism."

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