Wilkinsburg is a borough of around 15,000, east of Pittsburgh. The poor suburb is known for drug trafficking and gun violence, but neighbors told the Associated Press that the street where the shooting happened is generally quiet.
A local reverend, Maurice Trent, Jr., urged anyone with information about the shooters to come forward.
"Somebody knows who did this," he said at Thursday's press conference. "The family appeal to you to pick up the phone and say something."