The suspect in the Fort Lauderdale Airport shooting was reportedly known to the FBI

The man authorities believe shot 13 people, five of them fatally, at Fort Lauderdale International Airport on Friday was known to the FBI prior to carrying out the massacre, CBS News reported.

Law enforcement sources told CBS that the suspected assailant, 26-year-old Esteban Santiago, walked into an FBI office in Anchorage, Alaska, in November 2016 claiming voices in his head were telling him to join ISIS.

Bryan Santiago, the suspect's brother, told The Associated Press that Esteban had been receiving psychological treatment in Alaska, where he had been living since 2014. He said he did not know what his brother was being treated for.

Santiago, who was born in New Jersey but moved to Puerto Rico with his family when he was 2 years old, served in Puerto Rico's National Guard and was deployed to Iraq in 2010, Puerto Rico's National Guard spokesman Maj. Paul Dahlen told The Associated Press.

Santiago received a "general discharge" from the National Guard in August for "unsatisfactory performance," a lieutenant with the Alaska National Guard told CBS.

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Shooting at Ft. Lauderdale-Hollywood International Airport
FORT LAUDERDALE, FL - JANUARY 06: Police direct traffic outside of Fort Lauderdale-Hollywood International airport after a shooting took place near the baggage claim on January 6, 2017 in Fort Lauderdale, Florida. Officials are reporting that five people wear killed and eight wounded in an attack from a single gunman. (Photo by Joe Raedle/Getty Images)

Esteban Santiago, is shown in this booking photo provided by the Broward County Sheriff's Office in Fort Lauderdale, Florida, January 7, 2017.

(Courtesy Broward County Sheriff's Office/Handout via REUTERS)

Police question people who are evacuating from Fort Lauderdale-Hollywood International Airport near the tarmac after airport shooting in Florida, U.S., January 6, 2017. REUTERS/Andrew Innerarity

Esteban Santiago, the suspect in the mass shooting at Fort Lauderdale International Airport, is transported to the Broward County Main Jail by authorities on Saturday, Jan. 7, 2017.

(Jim Rassol/Sun Sentinel/TNS via Getty Images)

FORT LAUDERDALE, FL - JANUARY 06: People wait on the tarmac of Fort Lauderdale-Hollywood International airport after a shooting took place near the baggage claim on January 6, 2017 in Fort Lauderdale, Florida. Officials are reporting that five people wear killed and eight wounded in an attack from a single gunman. (Photo by Joe Raedle/Getty Images)
Law enforcement personnel search the grounds after a shoot opened fire at a baggage carousel at Fort Lauderdale-Hollywood International Airport in Fort Lauderdale, Florida, U.S., January 6, 2017. REUTERS/Zachary Fagenson
A man is helped after airport shooting at Fort Lauderdale-Hollywood International Airport in Florida, U.S., January 6, 2017. Courtesy Mike Starobinsky/Maxwillsolutions/Handout via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. NO RESALES. NO ARCHIVE.

Airport security personnel stand in front of one of the entrances to the baggage area of Terminal 2, where yesterday a shooter killed five people and wounded six others before he was taken into custody, at the Fort Lauderdale-Hollywood International airport on January 7, 2017 in Fort Lauderdale, Florida. The alleged gunman, Esteban Santiago, 26, is reported to have flown from Alaska to Florida with a gun in a checked bag, and after landing used the gun to shoot people.

(Photo by Joe Raedle/Getty Images)

Shooting victims are unloaded from an emergency vehicle and taken into Broward Health Trauma Center Friday, Jan. 6, 2017 in Fort Lauderdale, Fla. Authorities said multiple people have died after a lone suspect opened fire at the Ft. Lauderdale-Hollywood International Airport. (Taimy Alvarez/South Florida Sun-Sentinel/TNS via Getty Images)

Broward County Sheriff officers exit from the escalator that takes people from the baggage area of Terminal 2 where yesterday a shooter killed five people and wounded six others before he was taken into custody, at the Fort Lauderdale-Hollywood International airport on January 7, 2017 in Fort Lauderdale, Florida. The alleged gunman, Esteban Santiago, 26, is reported to have flown from Alaska to Florida with a gun in a checked bag, and after landing used the gun to shoot people.

(Photo by Joe Raedle/Getty Images)

A shooting victim is unloaded from an emergency vehicle and taken into Broward Health Trauma Center Friday, Jan. 6, 2017 in Fort Lauderdale, Fla. Authorities said multiple people have died after a lone suspect opened fire at the Ft. Lauderdale-Hollywood International Airport. (Taimy Alvarez/South Florida Sun-Sentinel/TNS via Getty Images)
A shooting victim is unloaded from an emergency vehicle and taken into Broward Health Trauma Center Friday, Jan. 6, 2017 in Fort Lauderdale, Fla. Authorities said multiple people have died after a lone suspect opened fire at the Ft. Lauderdale-Hollywood International Airport. (Taimy Alvarez/South Florida Sun-Sentinel/TNS via Getty Images)
A shooting victim is unloaded from an emergency vehicle and taken into Broward Health Trauma Center Friday, Jan. 6, 2017 in Fort Lauderdale, Fla. Authorities said multiple people have died after a lone suspect opened fire at the Ft. Lauderdale-Hollywood International Airport. (Taimy Alvarez/South Florida Sun-Sentinel/TNS via Getty Images)
Travelers and airport workers are evacuated out of the terminal after airport shooting at Fort Lauderdale-Hollywood International Airport in Florida, U.S., January 6, 2017. REUTERS/Andrew Innerarity
Travelers are evacuated out of the terminal and onto the tarmac after airport shooting at Fort Lauderdale-Hollywood International Airport in Florida, U.S., January 6, 2017. REUTERS/Zachary Fagenson
Law enforcement walk outside a terminal after a shooter opened fire at a baggage carousel at Fort Lauderdale-Hollywood International Airport in Fort Lauderdale, Florida, U.S., January 6, 2017. REUTERS/Zachary Fagenson
Law enforcement personnel take cover below a stairwell in a parking garage opposite a terminal after a shooter opened fire at a baggage carousel at Fort Lauderdale-Hollywood International Airport in Fort Lauderdale, Florida, U.S., January 6, 2017. REUTERS/Zachary Fagenson
FORT LAUDERDALE, FL - JANUARY 06: Police assist people seeking cover outside of Terminal 2 at Fort Lauderdale-Hollywood International airport after a shooting took place near the baggage claim on January 6, 2017 in Fort Lauderdale, Florida. Officials are reporting that five people wear killed and eight wounded in an attack from a single gunman. (Photo by Joe Raedle/Getty Images)
FORT LAUDERDALE, FL - JANUARY 06: People seek cover on the tarmac of Fort Lauderdale-Hollywood International airport after a shooting took place near the baggage claim on January 6, 2017 in Fort Lauderdale, Florida. Officials are reporting that five people wear killed and eight wounded in an attack from a single gunman. (Photo by Joe Raedle/Getty Images)
FORT LAUDERDALE, FL - JANUARY 06: People take cover outsideTerminal 2 of Fort Lauderdale-Hollywood International airport after a shooting took place near the baggage claim on January 6, 2017 in Fort Lauderdale, Florida. Officials are reporting that five people wear killed and 8 wounded in an attack from a single gunman. (Photo by Joe Raedle/Getty Images)
FORT LAUDERDALE, FL - JANUARY 06: People take cover behind cars outside of Terminal 2 of Fort Lauderdale-Hollywood International airport after a shooting took place near the baggage claim on January 6, 2017 in Fort Lauderdale, Florida. Officials are reporting that five people wear killed and 8 wounded in an attack from a single gunman. (Photo by Joe Raedle/Getty Images)
FORT LAUDERDALE, FL - JANUARY 06: People wait on the tarmac of Fort Lauderdale-Hollywood International airport after a shooting took place near the baggage claim on January 6, 2017 in Fort Lauderdale, Florida. Officials are reporting that five people wear killed and eight wounded in an attack from a single gunman. (Photo by Joe Raedle/Getty Images)

Esteban Santiago, the suspect in the mass shooting at Fort Lauderdale International Airport, is transported to the Broward County Main Jail by authorities on Saturday, Jan. 7, 2017.

(Jim Rassol/Sun Sentinel/TNS via Getty Images)

A shooting victim is unloaded from an emergency vehicle and taken into Broward Health Trauma Center Friday, Jan. 6, 2017 in Fort Lauderdale, Fla. Authorities said multiple people have died after a lone suspect opened fire at the Ft. Lauderdale-Hollywood International Airport. (Taimy Alvarez/South Florida Sun-Sentinel/TNS via Getty Images)
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His aunt, who lives in New Jersey, told reporters that Santiago had started acting strangely when he returned from Iraq, and about a month ago "lost his mind."

"He said he saw things," his aunt, Maria Luisa Ruiz, told reporters outside her home in Union City, New Jersey. She mentioned that he had just become a father in September.

Santiago was charged with fourth-degree assault about one year ago in Anchorage in an incident related to domestic violence, police told the Daily Beast.

Santiago flew Delta from Anchorage, Alaska to Fort Lauderdale via Minneapolis-St. Paul on Thursday night, NBC reported. He arrived in Fort Lauderdale late Friday morning, which is when he apparently he used a gun he had checked into his luggage to carry out the massacre in the baggage claim area of Terminal 2.

Santiago is being interviewed by a team of FBI agents and homicide detectives, Broward County Sheriff Scott Israel said in a press conference Friday.

"At this point it looks like he acted alone," Israel said of the suspect. He noted that "it's too early to say either way" whether this was an act of terrorism.

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