Fifty people are now known to have died in Friday's shooting in a gay nightclub in Orlando, Florida, and a "state of emergency" has been declared, the city's mayor has said.
The gunman, named by officials as Omar Mateen, was killed after taking hostages.
Another 53 people were injured in the shooting at the Pulse club.
It is the worst mass shooting in US history. Police described it as an act of terrorism.
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