One person has been killed and 14 injured in a shooting at the Cameo Night Club in Cincinnati, Ohio.
Police initially said at least two shooters were involved, but Cincinnati Assistant Police Chief Paul Neudigate has since tweeted that there is “only one reported shooter”.
There was no indication the shooting was terror-related, he said.
Several people have life-threatening injuries, Mr Neudigate told news channel WLWT-TV.
“We are in the middle of a very horrific situation that occurred at the nightclub with multiple victims. It’s going to be a long night for our homicide units to investigate,” he said.
Earlier Police Captain Kimberly Williams said there were at least two reported gunmen, who were still at large and the force did not have good descriptions of them. Witnesses had been reluctant to co-operate, she added.
“At this point it’s unclear exactly what instigated the shooting,” Capt Williams told reporters.
The shooting happened at about 01:00 (05:00 GMT) while hundreds of people were in the venue. There was “chaos” in the aftermath, Capt Williams said.
The Cameo Night Club had had problems in the past “but this is by far the worst”, she added.
The shooting comes less than a year after gunman Omar Mateen opened fire at a gay nightclub in Orlando, Florida.
Mateen killed 49 people in the deadliest mass shooting in US history.
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Ohio nightclub shooting: One dead, 14 injured, police say