A gunman, identified as Omar Mateen, killed 50 people and wounded at least 53 more at a gay club at 2am in Orlando, Florida. The nightclub and bar, called Pulse, had an estimated 100 people in attendance when Mateen began opening fire upon the crowd early Sunday morning. The bloody scene ended hours later when police stormed the building and killed the shooter.

Dozens of partygoers remained hostages in the club for several hours after the initial shooting, prompting SWAT teams to rush inside. The shooter was armed with an “assault-type rifle” and a handgun. Mateen’s death was confirmed at 6am.

Federal authorities say Mateen, 29, has possible ties to terrorism and radical Islamic ideology. Mateen was a U.S. citizen, Rep. Alan Grayson said in a press conference, though that was “not true of other family members of his.” Mateen was born in New York to parents of Afghan origin and was a Muslim, who resided in Fort Pierce, Fla prior to his killing. Mateen was married to someone from the Middle East.

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A licensed security officer, Mateen had a Statewide Firearms License. Authorities were searching Mateen’s belongings on Sunday morning trying to identify a motive for the attack.

“More likely than not, that it was an ideologically motivated attack. It’s not coincidence the attack took place where it did and when it did,” Grayson said, though he said it was unclear if Mateen was linked to any terror groups.

Orlando Mayor Buddy Dyer asked Gov. Rick Scott to declare a state of emergency following the attack. Orlando Regional Medical Center called in six trauma surgeons, including a pediatric surgeon, as victims were brought in, Dr. Michael Cheatham said. Many wounded were “critically ill” due to the nature of their injuries, Cheatham said, and the hospital was trying to reach out to their families. ORMC also made a request for blood donors in the area due to the severity of the situation.

“There are allegations the individual made threats in the past to having ties to terrorist organizations. At this time we’re looking at all angles right now,“FBI Special Agent in Charge Ron Hopper said. “We do have suggestions that that individual may have leanings toward [radical Islam], that particular ideology. But right now we can’t say definitively so we’re still running everything around.”

The incident “is being investigated as an act of terrorism,” said Danny Banks, special agent in charge at the Florida Department of Law Enforcement. The FBI investigated Mateen three years ago, but cleared him of any charges or ties to terrorist organizations.

The attack comes a few days after “The Voice” contestant Christina Grimmie, 22, was shot dead at her own concert.

Presidential candidate Donald Trump responded through Twitter about the Orlando attack: