At least 5 people were killed and 18 injured in a shooting at a nightclub for gender minorities on Saturday night in Colorado Springs, Colorado, police said.

A suspect was in custody and was being treated for injuries after the attack at Club Q, Colorado Springs police Lieutenant Pamela Castro told a news conference.

Police got the initial phone call just before midnight about the shooting, Castro said, adding that upon arrival, officers located one person who was believed to be the suspect inside the club.

She did not give any information on the motive for the attack and declined to say what kind of firearm was used in the shooting.

The club said in a statement on its Facebook page, that it was "devastated by the senseless attack on our community ... We thank the quick reactions of heroic customers that subdued the gunman and ended this hate attack."

Images of the scene after the shooting showed security and emergency vehicles with flashing blinkers parked on a street near the venue.

By 4 a.m. (1100 GMT), police had taped off the area around the club, which is located in a strip mall on the outskirts of Colorado Springs.

In 2016, a gunman killed 49 people at another nightclub for gender minorities in Orlando, Florida, before he was shot dead by police. At the time it was the worst mass shooting in recent U.S. history.

The shooter had claimed allegiance to a leader of Daesh. He was killed in an exchange of gunfire with police.