One man sustained a broken leg in the incident. Others suffered bumps, bruises, cuts and scratches, police said.
Police have released pictures hoping to identify more students involved in the party that turned rowdy.
The country’s top pitmasters made their way to Mid Town on Saturday and Sunday for the 10th Annual BBQ Block Party in Madison Square Park.
Angel Alvarez suffered 27 bullet wounds during the chaos in Harlem, which began when he got into a fistfight with a neighborhood rival, and escalated when the other man pulled out a pistol.
The grand jury declined to indict the four officers who fired 46 bullets during a chaotic chain of events that unfolded Aug. 8, said the two people, who spoke on condition of anonymity because of the secrecy of the proceeding.
Prosecutors had been scheduled to reveal Wednesday whether the only man arrested in the Aug. 8 mayhem had been indicted. But they said the case was still before the grand jury.
A police officer says he saw a gun in the hand of a collapsed man who had been shot multiple times in a burst of bullets at a Harlem block party.