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The Latest: Some say Orlando shooter was a regular at club

  • A rainbow appears behind the U.S. flag flying at half-staff on top of the Tacoma Dome, Monday, June 13, 2016, in Tacoma, Wash. Flags across the state were at half-staff Monday to honor the victims of a mass shooting early Sunday at a gay nightclub in Orlando, Florida. (AP Photo/Ted S. Warren)

    A rainbow appears behind the U.S. flag flying at half-staff on top of the Tacoma Dome, Monday, June 13, 2016, in Tacoma, Wash. Flags across the state were at half-staff Monday to honor the victims of a mass shooting early Sunday at a gay nightclub in Orlando, Florida. (AP Photo/Ted S. Warren)  (The Associated Press)

  • People hold up candles against a rainbow lit backdrop during a vigil for those killed in a mass shooting at the Pulse nightclub downtown Monday, June 13, 2016, in Orlando, Fla. A gunman has killed dozens of people in a massacre at a crowded gay nightclub in Orlando on Sunday, making it the deadliest mass shooting in modern U.S. history. (AP Photo/David Goldman)

    People hold up candles against a rainbow lit backdrop during a vigil for those killed in a mass shooting at the Pulse nightclub downtown Monday, June 13, 2016, in Orlando, Fla. A gunman has killed dozens of people in a massacre at a crowded gay nightclub in Orlando on Sunday, making it the deadliest mass shooting in modern U.S. history. (AP Photo/David Goldman)  (The Associated Press)

  • Doctors and medical staff that treated the victims of the Pulse nightclub shooting answer questions at a news conference at the Orlando Regional Medical Center, Tuesday, June 14, 2016, in Orlando, Fla. (Naseem Miller/Orlando Sentinel via AP) MAGS OUT; NO SALES; MANDATORY CREDIT

    Doctors and medical staff that treated the victims of the Pulse nightclub shooting answer questions at a news conference at the Orlando Regional Medical Center, Tuesday, June 14, 2016, in Orlando, Fla. (Naseem Miller/Orlando Sentinel via AP) MAGS OUT; NO SALES; MANDATORY CREDIT  (The Associated Press)

The Latest on the Florida nightclub shooting. (all times local):

5:20 a.m.

Jim Van Horn said he was a frequent patron at Orlando's Pulse night club. He said another "regular" at the Florida gay bar was Omar Mateen, the man who killed 49 and wounded dozens more early Sunday.

Speaking to The Associated Press late Monday, 71-year-old Van Horn says he saw Mateen trying to pick up men at the club.

Van Horn said he met Mateen once. He said the younger man was telling him about his ex-wife.

Van Horn says some friends then called him away and told him they didn't want him talking to Mateen because "they thought he was a strange person."

Despite Mateen's pledge of support to the Islamic State, other possible explanations emerged, including questions of whether he was conflicted about his sexuality.

His ex-wife said he suffered from mental illness. And his Afghan-immigrant father suggested he may have acted out of anti-gay hatred.

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3:15 a.m.

Thousands in Orlando are mourning 49 people killed inside a gay nightclub as federal investigators examine possible motives for the gunman who committed the worst mass shooting in modern U.S. history.

The White House and the FBI said 29-year-old Omar Mateen, an American born Muslim, appears to be a "homegrown extremist" who had touted support not just for the Islamic State, but other radical groups that are its enemies.

Meanwhile, Mateen's ex-wife says he suffered from mental illness. And his Afghan-immigrant father says his son got angry recently about seeing two men kiss.

Meanwhile, thousands gathered Monday night in downtown Orlando for a vigil to support victims and survivors of the Pulse nightclub shooting on the lawn of Orlando's main performing arts venue.