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A gunman opened fire inside a gay club in the US state of Colorado on Saturday night, killing five people and injuring 18.
A suspect was in custody and being treated for injuries, police said.
Club Q, in Colorado Springs, released a statement on Facebook saying it was "devastated by the senseless attack on our community", and thanking customers who "subdued" the gunman.
In 2016, 49 people were killed in a shooting at a gay club in Florida.
Colorado Springs police said they received an initial emergency call about an active shooter at 23:57 (06:57 GMT) on Saturday.
The suspect was found inside the club when police entered.
Police did not immediately suggest a motive for the shooting and said the number of dead and injured could change as the investigation continues.
A statement on the Club Q Facebook page thanked "the quick reactions of heroic customers that subdued the gunman and ended this hate attack".
In 2016, 49 people were killed and more than 50 injured in a shooting at the Pulse gay club in Orlando, Florida. At the time it was the deadliest mass shooting in US history.
President Obama called the attack "an act of terror and an act of hate".