MINEOLA, N.Y. (AP) _ About a dozen gang members held a man to the ground as he was stabbed to death during a rap concert where at least 13 people were either knifed or beaten, police said Sunday.

Three of the stabbing victims were listed in critical condition.

Deputy Police Chief Otto Geiger said investigators believe one gang was responsible for much of the violence at the Nassau Coliseum during Saturday night's ''Jam '88,'' which featured Eric B. and Rakim, Kool Moe Dee and Doug E. Fresh.

The killing was the latest in a series of violent incidents at rap concerts around the nation, including two stabbings during a Run-DMC concert at the Nassau Coliseum last month.

Geiger said metal detectors were used at the door, and he did not know how the knives were taken into the arena, where about 100 private security guards and 100 Nassau County police officers patrolled the audience of about 10,000.

''Every precaution was taken to ensure the safety of those persons attending the concert,'' said coliseum spokeswoman Hilary Hartung. ''However, there seems to be a small element in society that attends this type of concert solely for the purpose (of creating) problems for those who come to enjoy the show. The Nassau Coliseum will not condone this type of behavior and will thoroughly investigate the future of rap concerts.''

Julio Fuentes, 19, was stabbed in the heart when he refused to relinquish the gold-plated chains he was wearing, Geiger said.

He was pronounced dead shortly after arrival at the Nassau County Medical Center in East Meadow.