
The "terrorist" attacker, who shot dead 50 people in a gay nightclub in Orlando, has been named as Omar Mateen.
Authorities are investigating whether the gunman, a 29-year-old US citizen of Afghan descent, had ties to Islamist extremism, according to US TV networks.
The gunman, carrying a device thought to be a bomb and armed with an assault rifle and a handgun, opened fire in the Pulse Orlando bar in the early hours of Sunday morning before taking hostages.
The attacker was involved with a three-hour stand-off with officers before SWAT teams stormed the building and shot him dead.
Some 52 people are being treated for injuries in hospitals in Orlando, according to authorities.
Law Enforcement Agent Danny Banks described the attack as an "act of terrorism" and said: "Whether that is domestic terrorist activity or an international one, that is something we will certainly get to the bottom of."

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