Authorities are investigating the shooting death of a 39-year-old man in West Philadelphia.

Officers responding to a report of a person with a gun just after 1:45 a.m. Friday found the man in a parking lot on the 5500 block of Arch Street, suffering from a gunshot wound to his head, Philadelphia police said.

The man, whose name was not immediately released, was pronounced dead at the scene at 1:53 a.m.

No arrests have been made and police had no description of any suspect.

The motive for the deadly shooting also wasn't known.