Omar Mateen, who authorities say killed 49 people at the gay nightclub Pulse in Orlando, Fla., was reportedly no stranger to the club.Multiple media outlets are reporting that some Pulse regulars recognized Mateen, saying that he spent time at the nightclub before the shooting early Sunday.Meanwhile, at least two men say they interacted with Mateen on gay dating apps.

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" 'I said, "That's him," ' West said, and turned over his phone and Jack'd log-in information to the FBI, which still had the phone late Monday, he said." that he'd seen Mateen at the club before — also told MSNBC he'd seen Mateen on a gay hookup app. Investigators are currently looking into the reports of Mateen's prior visits to Pulse and use of gay dating apps, which have not been officially confirmed.

In general, NPR's Jeff Brady notes, Mateen's motivations remain murky.

"Maybe he was someone who was in the closet, maybe he had other motivations," Jeff said Tuesday morning.

Smith and Callen decided to keep their distance from Mateen after they saw him pull a knife at Pulse and threaten another patron, they told the Canadian news agency.

Another Pulse regular, Kevin West, told the Los Angeles Times he hadn't seen Mateen at the club until shortly before the shooting.

But he recognized him — from Jack'd, a gay dating and chat app.

The "As soon as West saw photos of Mateen released after the shooting, he said, he drove to his local police station, where officers summoned FBI officials, who showed him a photo of Mateen on a computer screen.

The Orlando Sentinel writes that "at least four regular customers" at Pulse said they had seen Mateen before.

Ty Smith told the paper that Mateen would sometimes "get so drunk he was loud and belligerent." Smith and his husband, Chris Callen, also spoke to The Canadian Post and said they had seen Mateen at Pulse multiple times.