HAYWARD -- An early Sunday shooting near Glassbrook Elementary School wounded one person and left investigators trying to piece together a motive amid tight-lipped witnesses, police said.

Officers were called at 5:40 a.m. to a home at 26447 Gading Road for a report of a person suffering from a gunshot wound, Sgt. Ken Forkus said.

Police learned that the victim -- a 25-year-old Hayward man --was standing outside a home with a 48-year-old Hayward man when a sport utility vehicle drove up and a man in the passenger seat began firing shots at the men.

At least one of the bullets struck the victim in the left forearm, Forkus said. The man's friend was not injured.

The victim was taken to a local hospital in stable condition where he was kept overnight for observation, Forkus said.

Police described the shooter as a heavy set man, age 18-20. He wore a red baseball cap, a dirty, white T-shirt and rode in a white older-model SUV. A complete description of the SUV's driver was not available.

Police said the victims were uncooperative with responding officers, who searched the area following the emergency call but as of Monday did not report any findings.

Anyone with information about the shooting is asked to call police at 510-293-7000 or an anonymous tip line: 510-293-7197.

Contact Natalie Neysa Alund at 510-293-2469. Follow her at Twitter.com/nataliealund.