Pulse nightclub shooter used Google during three-hour standoff with police

The man who murdered 49 people at a Florida nightclub used Google while taking shelter from police in desperate hopes of fixing his jammed assault rifle, authorities said Wednesday.

Nearly three years after Omar Mateen's deadly rampage at the Pulse, a gay nightclub in Orlando, Orange-Osceola State Attorney Aramis Ayala cleared all 13 police officers and sheriff's deputies who opened fire that night.

Every officer-involved shooting in Florida must be reviewed by local prosecutors, and Ayala found that all rounds fired by responding police and sheriff's deputies were justified.

And during a 40-minute-long press conference, Ayala and Assistant State Attorney Deborah Barra revealed several new details of what was once America's worst mass killing.

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An aerial view shows the Pulse gay night club after a mass shooting in Orlando, Florida, U.S. June 12, 2016. REUTERS/Carlo Allegri
Friends and family members embrace outside the Orlando Police Headquarters during the investigation of a shooting at the Pulse nightclub, where people were killed by a gunman, in Orlando, Florida, U.S June 12, 2016. REUTERS/Steve Nesius TPX IMAGES OF THE DAY
Friends and family members embrace outside the Orlando Police Headquarters during the investigation of a shooting at the Pulse nightclub, where people were killed by a gunman, in Orlando, Florida, U.S June 12, 2016. REUTERS/Steve Nesius
Friends and family members embrace outside the Orlando Police Headquarters during the investigation of a shooting at the Pulse nightclub, where people were killed by a gunman, in Orlando, Florida, U.S June 12, 2016. REUTERS/Steve Nesius
ORLANDO, FL - JUNE 12: FBI agents investigate near the damaged rear wall of the Pulse Nightclub where Omar Mateen allegedly killed at least 50 people on June 12, 2016 in Orlando, Florida. The mass shooting killed at least 50 people and injuring 53 others in what is the deadliest mass shooting in the country's history. (Photo by Joe Raedle/Getty Images)
ORLANDO, FL - JUNE 12: FBI agents investigate near the damaged rear wall of the Pulse Nightclub where Omar Mateen allegedly killed at least 50 people on June 12, 2016 in Orlando, Florida. The mass shooting killed at least 50 people and injuring 53 others in what is the deadliest mass shooting in the country's history. (Photo by Joe Raedle/Getty Images)
ORLANDO, FL - JUNE 12: FBI agents investigate near the damaged rear wall of the Pulse Nightclub where Omar Mateen allegedly killed at least 50 people on June 12, 2016 in Orlando, Florida. The mass shooting killed at least 50 people and injuring 53 others in what is the deadliest mass shooting in the country's history. (Photo by Joe Raedle/Getty Images)
Friends and family members embrace outside the Orlando Police Headquarters during the investigation of a shooting at the Pulse night club, where as many as 20 people have been injured after a gunman opened fire, in Orlando, Florida, U.S June 12, 2016. REUTERS/Steve Nesius TPX IMAGES OF THE DAY
Demetrice Naulings sobs outside the Orlando Police Headquarters where police are interviewing witnesses in the investigation of a shooting at the Pulse nightclub, where people were killed by a gunman, in Orlando, Florida, U.S June 12, 2016. REUTERS/Steve Nesius
Concerned friends and family of victims of the Pulse nightclub shooting wait outside of the Orlando Police Department on Sunday, June 12, 2016. (Joe Burbank/Orlando Sentinel/TNS via Getty Images)
Ray Rivera, DJ at the Pulse nightclub, is consoled by a friend outside of the Orlando Police Department on Sunday, June 12, 2016. (Joe Burbank/Orlando Sentinel/TNS via Getty Images)
Police stand in front of one of the houses that officials indicated was connected to the Orlando shooter in Port St. Lucie, Florida, U.S. June 12, 2016. REUTERS/Joe Skipper
An aerial view shows the Pulse gay night club after a mass shooting in Orlando, Florida, U.S. June 12, 2016. REUTERS/Carlo Allegri
Police stand in front of one of the houses that officials indicated was connected to the Orlando shooter in Port St. Lucie, Florida, U.S. June 12, 2016. REUTERS/Joe Skipper
ORLANDO, FL - JUNE 12: FBI agents investigate near the damaged rear wall of the Pulse Nightclub where Omar Mateen allegedly killed at least 50 people on June 12, 2016 in Orlando, Florida. The mass shooting killed at least 50 people and injuring 53 others in what is the deadliest mass shooting in the country's history. (Photo by Joe Raedle/Getty Images)
ORLANDO, FL - JUNE 12: FBI agents investigate near the damaged rear wall of the Pulse Nightclub where Omar Mateen allegedly killed at least 50 people on June 12, 2016 in Orlando, Florida. The mass shooting killed at least 50 people and injuring 53 others in what is the deadliest mass shooting in the country's history. (Photo by Joe Raedle/Getty Images)
Officers arrive at the Orlando Police Headquarters during the investigation of a shooting at the Pulse nightclub, where people were killed by a gunman, in Orlando, Florida, U.S June 12, 2016. REUTERS/Steve Nesius
An aerial view shows the Pulse gay night club after a mass shooting in Orlando, Florida, U.S. June 12, 2016. REUTERS/Carlo Allegri
Orlando Police Chief John Mina and other city officials answer the media's questions about the Pulse nightclub shooting in Orlando, Florida June 12, 2016. REUTERS/Kevin Kolczynski
Police lock down Orange Avenue around Pulse nightclub, where people were killed by a gunman in a shooting rampage in Orlando, Florida June 12, 2016. REUTERS/Kevin Kolczynski
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Mateen was armed with an assault rifle and pistol when he walked into Pulse on June 12, 2016. That rifle jammed during the assault, before Mateen took shelter in the restroom for three hours.

While hunkered down, Mateen called 911 five times and used his smartphone for internet research.

"He was also on his phone and he was Googling how to spell the word 'allegiance' and he also tried to research how to unjam his firearm," Barra said. "Again, we know that he was not successful in figuring that out."

When police finally busted down a wall and used a flash-bang grenade to disorient Mateen, 10 officers and three deputies descended on the killer, Barra said.

Officers fired 172 shots, striking Mateen seven times, she added.

Mateen had earlier told police he had explosives. So when law enforcement approached Mateen's lifeless body, they spotted what looked like wires on him, and they feared he still might be able to trigger a bomb.

That's when one officer fired one more shot into Mateen's prone body, prosecutors revealed.

But it turned out, the wires near Mateen were from an "exit" sign that had fallen on him during the final shootout, authorities said.

"When the officer walks up and, knowing that he had previously talked about bombs being present and he saw wires and whatnot, it only takes that for something terrible to happen," Barra said, pressing her thumb to her index finger simulating a detonation.

"And so the officer made sure that did not happen."

At the time, Mateen's killing spree was the worst mass shooting in U.S. history.

It was eclipsed on Oct. 1, 2017, when Stephen Paddock murdered 58 people at a country music festival in Las Vegas from his nest on the 32nd floor of the Mandalay Bay Resort.

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