What we know about suspected Orlando nightclub shooter Omar Mateen

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Sources: Suspected Orlando club shooter identified as Omar Mateen

Officials have identified the suspected gunman in the Orlando gay nightclub mass shooting that left at least 50 dead and more than 50 others wounded as Omar Mateen, a 29-year-old from Port Saint Lucie, Florida.

Mateen's parents are from Afghanistan, and according to ABC News he was "on the radar" of U.S. officials but was never under specific investigation. Law enforcement sources told NBC News that Mateen called 911 moments before and pledged allegiance to the leader of ISIS.

Mir Seddique, Mateen's father, told NBC News, "this has nothing to do with religion," claiming his son was angered after seeing two men kissing in Miami recently.

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Omar Mateen, suspected Orlando nightclub shooter
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What we know about suspected Orlando nightclub shooter Omar Mateen
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St. Lucie Sheriff Deputy William Minogue, 31, told AOL.com that Mateen "tried to get hired with Fort Pierce Police Department," before accepting a job as a security guard.

According to Minogue, who also attended Mariposa Elementary school with the gunman, Mateen "worked at St. Lucie county courthouse screening people for weapons."

An Orlando woman, who requested anonymity, remembers attending middle school with Mateen and tells AOL.com that he was a "trouble maker in school," and alleges Mateen once "punched a teacher and was supposed to be expelled but wasn't."

Authorities are reportedly investigating the shooting as an act of terrorism. Orange County Sheriff Jerry Demings has stated the incident "could definitely be classified as domestic terrorism."

FBI assistant agent in charge Ron Hopper said this morning "we do have suggestions that that individual may have leanings towards that, that particular ideology [Islamic extremism]. But right now we can't say definitively, so we're still running everything around."

Mateen was killed in a gunfight with those officers early this morning, officials said.

Images from the Orlando Pulse nightclub shooting:

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Pulse nightclub shooting
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What we know about suspected Orlando nightclub shooter Omar Mateen
Orlando Police officers direct family members away from a multiple shooting at a nightclub in Orlando, Fla., Sunday, June 12, 2016. A gunman opened fire at a nightclub in central Florida, and multiple people have been wounded, police said Sunday. (AP Photo/Phelan M. Ebenhack)
Brandon Shuford, left, waits down the street from the scene of a shooting involving multiple fatalities at a nightclub in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack)
Bystanders wait down the street from a multiple shooting at the Pulse nightclub in Orlando, Fla., Sunday, June 12, 2016. A gunman opened fire at a nightclub in central Florida, and multiple people have been wounded, police said Sunday. (AP Photo/Phelan M. Ebenhack)
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
Orlando Mayor Buddy Dyer, center right, and Orlando Police Chief John Mina, center left, arrive to a news conference after a fatal shooting at Pulse Orlando nightclub in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack)
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
Jermaine Towns, left, and Brandon Shuford wait down the street from a multiple shooting at a nightclub in Orlando, Fla., Sunday, June 12, 2016. Towns said his brother was in the club at the time. A gunman opened fire at a nightclub in central Florida, and multiple people have been wounded, police said Sunday. (AP Photo/Phelan M. Ebenhack)
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)
Jermaine Towns, left, and Brandon Shuford wait down the street from a multiple shooting at a nightclub in Orlando, Fla., Sunday, June 12, 2016. Towns said his brother was in the club at the time. A gunman opened fire at a nightclub in central Florida, and multiple people have been wounded, police said Sunday. (AP Photo/Phelan M. Ebenhack)
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)
FBI assistant special agent in charge Ron Hopper, center, answers questions from members of the media after a fatal shooting at Pulse Orlando nightclub in Orlando, Fla., Sunday, June 12, 2016. Listening are Orlando Police Chief John Mina, left, and Orange County Mayor Teresa Jacobs. (AP Photo/Phelan M. Ebenhack)
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
An Orange County Sheriff's Department SWAT member arrives to the scene of a fatal shooting at Pulse Orlando nightclub in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack)
Orange County Sheriff's Department SWAT members arrive to a fatal shooting at Pulse Orlando nightclub in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack)
Police cars and emergency vehicles surround the Pulse Orlando nightclub, the scene of a fatal shooting, in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack)
A police officer stands guard outside the Orlando Regional Medical Center hospital after a fatal shooting at a nearby Pulse Orlando nightclub in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack)
Emergency personnel wait with stretchers at the emergency entrance to Orlando Regional Medical Center hospital for the arrival of patients from the scene of a fatal shooting at Pulse Orlando nightclub in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack)
Police cars surround the Pulse Orlando nightclub, the scene of a fatal shooting, in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack)
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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