A group of teenagers and young adults ran amok, squaring off against one another and harassing pedestrians along a one-mile stretch of midtown near the Jacob A. Javits Center, where the New York International Auto Show is held, police said.

Police spokesman Paul J. Browne said additional officers were on patrol because similar problems have happened during past auto shows.

It's something we watch over and we prepare for it in advance.” Four people were arrested related to the shootings — three males ages 17 to 23 and a teenage girl — and investigators were still working to identify the gunmen. Fifty other people were arrested, mostly on charges of disorderly conduct.

Police described those arrested as mostly teens and young adults who live in the city's outer boroughs.

A man was shot in the ankle at Eighth Avenue and 40th Street around 12:10 a.m. Shortly after, a woman was hit with a BB gun several blocks northeast at Seventh Avenue and 51st Street. About two hours later, two women were shot — one in the elbow and another in the thigh — near Seventh Avenue and 34th Street.

All four were in stable condition, police said.