The Latest on the massacre at a gay Orlando nightclub (all times local):

6:45 a.m.

The London-based security company that employed the Florida nightclub shooter says it received one complaint about him during his nine years of employment.

The 2013 complaint prompted G4S to transfer Omar Mateen. It came from St. Lucie County Courthouse, where he was a security guard. The FBI then investigated Mateen.

G4S spokesman Nigel Fairbrass said Wednesday that it was the only complaint about Mateen since he was hired in 2007.

Former G4S employee Daniel Gilroy has told the New York Times and other news outlets that he had alerted G4S about Mateen's behavior. G4S says it has no records of any complaints by Gilroy. Gilroy has called Mateen loud and profane and accused him of threatening violence.

Fairbrass says of Gilrory: "We reached out to him and have since confirmed that he did, in fact, not file any formal complaint."

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3 a.m.

Investigators trying to find out what motivated nightclub killer Omar Mateen are casting a wide net.

The FBI is checking reports that Mateen frequented a gay dance club in Orlando before going on a murderous rampage there. Investigators also are looking at whether his wife knew anything beforehand about the deadliest mass shooting in modern US history. The attack left Mateen and 49 victims dead.

On Tuesday, a U.S. official said the FBI was looking into news reports quoting patrons of Pulse as saying Mateen frequented the nightspot and reached out to men on gay dating apps. The official wasn't authorized to discuss the investigation and spoke on condition of anonymity.

President Barack Obama said investigators had no information to suggest a foreign terrorist group directed the attack.