Still: Twitter/Myles Miller

At least four people were shot, one fatally, on Wednesday when gunfire broke out at Manhattan’s Irving Plaza, where rapper T.I. was scheduled to perform.

Police say the shooting occurred shortly after 10 p.m. in a third-floor green room. As of 12 a.m. local time, no arrests had been made.

“Everybody was having a good time until everybody started running,” a witness told NBC New York. “They didn’t search nobody, they didn’t check no IDs.”

More than 1,000 people attended the concert, The New York Post reports.