CHICAGO, Ill. (AP) — Chicago police say a shooting at a house party held in honor of someone who was killed in April has wounded 13 people, four of them critically.

Two people are being questioned in the shooting that happened early Sunday. Police say it stemmed from some sort of dispute at the party.

The victims range in age from 16 to 48. Police say they suffered “different and various gunshot wounds to their bodies.”

Mayor Lori Lightfoot is urging people to come forward with information. She met with victims at a Chicago hospital. She called the shooting “an act of cowardice.”