PHILADELPHIA (AP) — Philadelphia police are searching for two suspects who they say killed two men in a drive-by shooting.

Authorities say the shooting happened Wednesday night when the suspects drove up in a minivan and fired at a 22-year-old store clerk leaving work and a 37-year-old neighbor.

The 22-year-old man was pronounced dead at the scene. The 37-year-old man was rushed to an area hospital where he was later pronounced dead.

Investigators say the suspects used an assault rifle and a semi-automatic handgun.

Philadelphia Police Commissioner Richard Ross Jr. says one of the victims may have been targeted. Ross says a motive is unclear.

No arrests have been made. An investigation continues.