Man claiming to be Orlando shooter Omar Mateen’s former lover says the nightclub massacre was an act of revenge against gay Latin men not terrorism.

US investigators questions the wife of the gunman who killed 49 people at a gay nightclub in Orlando, the FBI say, and a law enforcement source says she could face criminal charges if there is evidence of any wrongdoing.

Here are a few excerpts from the survivors of the Orlando shooting who share their nightmarish experience as Omar Mateen shot 50 people dead, in what is said to be the worst mass shooting in US history.

Reports that Orlando gunman Omar Mateen had been a regular at the gay nightclub he attacked and used gay dating apps have led to speculation that he was motivated by internalised homophobia. But what is it, and could it have anything to do with the worst shooting in recent US history?

The wife of the gunman who killed 49 people at an Orlando gay nightclub could face criminal charges after a federal grand jury was convened to study possible wrongdoing by her, a law enforcement source says.

A survivor of the Orlando attack who was shot three times has described playing dead while Omar Mateen fired relentlessly at people on the floor.

The murky picture of Orlando gunman Omar Mateen grew more complex Tuesday with word that the FBI is investigating whether he had been a regular at the gay dance club he attacked and had been leading a secret life as a gay man.

G4S shares fell 4.9% on Monday after it emerged the company had employed Orlando gunman Omar Mateen, who killed 50 people in a Florida nightclub.

Vigils have been held in Orlando, Florida, and around the world for the victims of Sunday's deadly gun attack on a gay nightclub.

A gunman who killed dozens of people in a gay nightclub in Orlando, Florida, has been identified as Omar Mateen, a US citizen who had been known to the FBI since 2013.