PHILADELPHIA — There are no excuses for violence like the Memorial Day shooting at a Philadelphia park that killed two people and injured nine, the city’s mayor said Tuesday.

Two young adults died after the Monday night shooting in Fairmount Park, police Commissioner Kevin Bethel said Tuesday. Those injured in the Memorial Day shooting were listed in stable condition, he said. Police said no arrests have been made.

“This is a heinous act of violence that was inhumane. No regard for life,” Mayor Cherelle Parker said at a news conference. “We will not be held hostage by anyone who decides that they want to get assault-like, warlike weaponry.”

It wasn’t yet clear what led up to the shooting or whether those who were shot were targeted, the police commissioner said. No weapons had been recovered, but investigators found casings from three weapons, Bethel said. From the rapid-fire gunshots heard in videos shared on social media, he said they can determine that a switch, which automates a semiautomatic weapon, was used.

— The Associated Press