Officers were called to the 1500 block of North Stillman Street, a narrow street of rowhouses in the city's North Philadelphia section, where investigators marked roughly 47 shell casings for evidence, according to a preliminary account from the scene.

The volume of casings — enough to suggest multiple firearms may have been fired — is unusual for a single incident and is likely to be a focus of the investigation as detectives try to determine how many people were shooting and what prompted the gunfire. Police have not publicly identified any suspects or described a possible motive.

It was not immediately clear whether anyone was struck by the gunfire or whether property was damaged. Police did not say whether any vehicles or homes were hit.

The shooting adds to the toll of gun violence that continues to shape daily life in many North Philadelphia neighborhoods, where residents and community groups have long pressed for more resources for violence prevention and for faster, more transparent communication from police after incidents. The city has invested in a range of anti-violence programs in recent years, but shootings remain a persistent concern.

Police asked anyone with information about the incident to contact the department's tip line at 215-686-TIPS (8477) or to submit an anonymous tip online through the department's website. Investigators typically rely on witness accounts and surveillance footage in cases where no victims are immediately identified.

For people affected by gun violence, the city and its partners maintain a list of support resources, including counseling and victim services, available through Resolve Philly's gun violence resource page.

The investigation is ongoing.