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Forty-nine people are dead and at least 53 injured in the deadliest shooting in American history after Omar Mateen, a 29-year-old U.S. citizen, opened fire and took hostages inside the Pulse gay nightclub in Orlando, Fla.

What we know:

  • All 49 victims who were killed at Pulse on Sunday have now been identified. You can read their stories here.
  • Mateen made a series of Facebook posts before and during his attack raging against the "filthy ways of the West," according to a Senate committee letter.
  • President Obama met with victims' families in Orlando.
  • Investigators are focusing on the question of how much Mateen's current wife, Noor Zahi Salman, knew about his plans before the attack. She could face federal charges if she knew the attack was going to occur but failed to alert authorities.
  • Gunman Omar Mateen had used a gay dating app in the year before the shooting, and had visited Pulse several times before.
  • Follow coverage from the Orlando Sentinel and see a timeline of how the shooting unfolded.

FBI investigating whether Omar Mateen was a regular at Pulse

The Pulse nightclub in Orlando, Fla. (Joe Raedle/Getty Images)
The Pulse nightclub in Orlando, Fla. (Joe Raedle/Getty Images)

The FBI is investigating reports that Orlando gunman Omar Mateen had been a regular at the gay nightclub he attacked and had used gay dating apps, a U.S. official briefed on the case said Tuesday.

A number of possible explanations and motives for the bloodbath that left 49 victims dead have emerged, with Mateen professing allegiance to the Islamic State group, his ex-wife saying he was mentally ill, and his father suggesting he was driven by a hatred of gays.

The picture grew more complex as patrons of the Pulse came forward to say that they had seen the 29-year-old American-born Muslim there a number of times or that he had been using gay dating apps. Mateen had an ex-wife and 3-year-old son.

Jim Van Horn, 71, said Mateen was a regular at the club. "He was trying to pick up people. Men," Van Horn told the Associated Press. While acknowledging he didn't know Mateen well, Van Horn said: "I think it's possible that he was trying to deal with his inner demons, of trying to get rid of his anger of homosexuality."

The official who said the FBI is looking into those reports was not authorized to discuss the investigation publicly and spoke on condition of anonymity.


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