Story highlights "Everyone get out ... and keep running," club posts on social media
Police warn residents to stay away from area
(CNN) Gunfire erupted at a gay nightclub in Orlando early Sunday, with multiple injuries reported, Florida authorities said.
"Everyone get out of Pulse and keep running," the club posted on its Facebook page.
Orlando police warned residents to stay away from the area, and urged people not to call their offices.
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"Official updates will come from this Twitter account," they posted. "No email or phone calls please."
Pulse describes itself as "the hottest gay bar" in the heart of Orlando.
In the early morning hours of today, according to police, a man by the name of  entered , a gay club in Orlando, Florida, and opened fire. 50 people were killed and 53 were hospitalized.

It is now the largest  in United States history, with the  and Sandy Hook Elementary School shooting shootings the closest behind.  The shooter today used an automatic rifle according to one account; took hostages, and was eventually killed in a gun battle with  units.

Mateen's father, Mir Seddique, said in remarks to NBC News the attack was not about religion.  The shooter allegedly called , the emergency phone number in the United States, and pledged his allegiance to ISIS.  ISIS has claimed responsibility, according to a tweet from Reuters India.  Reportedly, many have praised the attack on pro-ISIS forums.

Orlando Mayor  has declared a state of emergency.

According to Orlando Police Chief John Mina, "It appears Omar Mateen was organized and well-prepared".

"It's just shocking ... just one after another after another ... It could have lasted a whole song", commented Christopher Hansen, who was getting a drink when gunshots rang out.