Authorities say the shooting happened late Monday night outside the PNC Bank Arts Center in Holmdel.
Two people were flown to area hospitals. Their conditions weren’t immediately known.
State police say the suspect fled into nearby woods and a search was underway early Tuesday.
Hip hop artists J. Cole and Big Sean had been performing at the venue.
Eighteen-year-old Omayma Bougdour tells the Daily News gunfire began after an argument broke out in the parking lot. She says “everyone started sprinting and stampeding.”
Big Sean and J. Cole, who are touring together, are to perform at Madison Square Garden in New York on Tuesday.