PITTSBURGH, Pennsylvania (AP) — Three people, including two teenagers, were wounded by gunfire late Saturday at an amusement park southeast of Pittsburgh, which was kicking off a Halloween-themed festival.

Allegheny County police said a 39-year-old man and two 15-year-old boys sustained leg wounds in the gunfire shortly before 11 pm Saturday at Kennywood Park in West Mifflin. Park security responded along with local and county police who were working a security detail at the park.

Emergency responders took the man and one of the youths to a hospital, where the man was treated for a gunshot wound to the leg and released. The youth was admitted with a gunshot wound to the leg, and another youth grazed on the leg was brought to the hospital by a relative; both teens were listed in stable condition.

Witnesses told investigators that two groups of teenagers were involved in an altercation in front of the Musik Express ride and shots were fired by a male wearing a black hooded sweatshirt and a dark coloured COVID mask. A handgun was found near the scene, police said.

Kennywood posted a statement on Twitter around 12:30 am Sunday saying the park had been closed for the night and all guests had exited. Officials said they were “aware of a situation that occurred this evening and are working with local law enforcement. The safety of our guests and team members are our top priority.”

The park says on its website that all guests, staff and management must pass through metal detectors at the entrance gate, and all bags, purses and coolers are subject to search. The site also says “weaponry of any kind is strictly prohibited at the park.”

Police are investigating using the park’s security cameras and witness statements, KDKA-TV reported. County police asked anyone with information or video to contact investigators. The Pittsburgh Public Safety Department said in a social media post that its officers were assisting.