Orlando night club shooter pledged allegiance to ISIS in 911 call

Omar Mateen was killed by SWAT officers after he shot and killed dozens of people, wounding many at a nightclub in Orlando, Fla.(CNN Newsource)

Omar Mateen, the man identified by authorities as the shooter who killed 50 people and wounded 53 others at an Orlando night club, called 911 and pledged his allegiance to ISIS, sources tell Sinclair.

Mateen called 911 shortly before the shooting to pledge his allegiance to ISIS, officials who have been briefed on the case tell Sinclair.

Our sources stressed that there is not yet have credible evidence that the shooter has a direct tie to an overseas group. The notion that Mateen is a lone wolf inspired by radical Islam is being explored, according to sources familiar with the case.

Citing law enforcement sources, NBC also reported that Mateen called 911 moments before the attack, pledging his allegiance to the leader of the terror group.

Mateen, NBC reported "appeared to be a follower of ISIS propaganda and referenced the Tsarnaev brothers, who carried out the Boston Marathon bombings in 2013, at the scene."

The FBI told reporters they became aware of the Mateen in 2013.

Mateen was interviewed twice after coworkers reported concerning comments he made, according to the FBI. The FBI did not provide specifics on what those comments were.

The FBI reported that Mateen was linked to Moner Mohammad Abusalha, an American suicide bomber.

The law enforcement agency discontinued their investigation after interviews which led them to determine Mateen's connection to ISIS was "inconclusive."

The SITE Intel Group, which monitors and reports on jihadist threats, said that the 'Amaq News Agency of the Islamic State is claiming "that an IS fighter was behind the deadly shooting at the Pulse nightclub in Orlando, Florida."

Rita Katz, the Director of SITE Intelligence Group, tweeted that the report does not mean the shooting was coordinated with ISIS and is likely due to reports of Mateen's ISIS pledge.

Mateen died after a SWAT team stormed the nightclub, officials identified him as the shooter early Sunday and photos of him surfaced shortly after.

"Photos are surfacing online of the suspect in the Orlando nightclub shootings that left more than 50 dead and 53 injured," The Hill reported Sunday afternoon.

Mateen, a Florida native, appeared to be "organized and well-prepared," for the attack, Police Chief John Mina told reporters, according to The Hill.

The attack has been condemned as "horrifying," "awful" and "tragic." It is the deadliest shooting to occur in U.S. history.

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