Officers found four spent shell casings and blood trails in a nearby alley. Photo via OnScene.TV.

A 25-year-old man was shot in the upper thigh early Saturday in City Heights, police said.

Officers responded to a report of a shooting in the area of 37th Street and Polk Avenue at 3:54 a.m. Saturday, but were unable to locate the victim, said Officer D. O’Brien of the San Diego Police Department.

Officers found four spent shell casings and blood trails in a nearby alley, O’Brien said.

The victim was later found at Scripps Mercy Hospital being treated for a gunshot wound to the back of his right upper thigh, the officer said. The wound was not considered to be life-threatening.

O’Brien said the victim and witnesses were uncooperative and refused to provide any information about the shooting.

The department’s Mid-City Division was handling the investigation.

— City News Service, Inc.