A 16-year-old boy and four men in their 20s were wounded by gunfire last night after a dispute turned violent during the Entertainers Basketball Classic in Harlem's famed Rucker Park. The fraught moments leading up to the shooting were captured on cell phone video and posted on (where else?) WorldstarHipHop.com. The video, below, shows a chaotic mob advancing on two men, and then the sounds of gunfire:

Nate Robinson, a former point guard for the Knicks, was in attendance to watch the game, and escaped unharmed. But five people were shot in the ankle, leg or arm during the shootout. DNAinfo reports that they're all listed in stable condition. No arrests have been made, but one witness says that during the chaos he saw the shooter calmly walk across the street to a supermarket and fire several more rounds.

It's unclear what prompted the senseless violence, which erupted just before 11 p.m., but witness Rodney Harris tells the Daily News it started in the stands. "They started arguing, about a bad call or something like that," Harris recalls. "The guy was standing no more than five feet away from me. He pulled a gun out of his pocket and shot once. He then shot one more time. Everyone started running. He was real close to me. I thought I got shot."