13 Wounded in Shooting Outside Arizona Nightclub

Thirteen people were wounded in a shooting Friday night outside a Phoenix-area nightclub, police said Saturday. No fatalities were reported, though two of the victims were in serious condition.

Police are looking for two young black male suspects they say fled the scene in the parking lot of The Clubhouse Music Venue in Tempe, Ariz. on foot, KTVK-TV reported.

Tempe Sgt. Steve Carbajal said some of the wounded drove themselves to various area hospitals, so police aren't sure if there were more victims in addition to the 13, according to the Associated Press.

Concertgoers had come to hear rapper Nipsey Hussle perform when "some sort of altercation" erupted outside, Carbajal said.

Paul Butler told KTVK-TV he was among the crowd waiting to get into the club when he heard a series of pops as the gunfire erupted.

"And you see everybody running, couple more shots, everybody running," Butler told the station. "It was pure chaos."

One patron, tweeting about the incident under the username @renten10, described a scene where she was "backed against the wall" and said people were losing their phones and high-heeled shoes in the panic, CNN reported.

Police didn't have immediate details about a motive or the type or number of guns used in the shooting.

After the shooting, Hussle -- who did not end up taking the stage -- wrote on his Twitter account: "Az....y'all gotta be cool man. This sh-t ain't rite."

This post has been updated since it was first posted.