A woman was killed and a man was critically injured after they were shot on the porch of a home in Philadelphia late Sunday night.

Police found 61-year-old Michelle Wilson and a 67-year-old man suffering from gunshot wounds and took them to Temple University Hospital.

Investigators believe at least one shooter opened fire on the pair, leaving at least 20 shell casings at the scene.

No arrests have been made, and police are reviewing public and private surveillance footage to identify the shooter or shooters, Fox 29 has reported.

Authorities have not determined whether the victims were the intended targets or what led to the shooting.