OAKLAND -- Two girls, ages 13 and 15, and a 21-year-old woman were hospitalized Wednesday afternoon after police said a man driving a stolen car deliberately hit them as they walked on an East Oakland sidewalk.

None of the injuries, mostly cuts and bruises, was life threatening, police said. The victims were taken to different hospitals for treatment. Police did not release their names or if they were related.

Police said the three were walking in the 3900 block of Nevil Street at 3:06 p.m., apparently having just left Brookdale Park about a quarter-block away. That portion of Nevil is a cul-de-sac that ends at the rear entrance to the park.

The three, who residents did not recognize and said they did not live in the area, may have briefly talked to the occupants of a Nissan car but kept walking westbound on Nevil. Police were trying to determine if the victims knew anyone in the car. The car had been reported stolen earlier in Oakland, police said.

As the three walked on the sidewalk, police said, the Nissan drove onto the sidewalk and hit them before crashing into a stone staircase of a house, mangling a metal railing and causing the airbags of the vehicle to activate. The front windshield was cracked, indicating a passenger in the car may have been injured.

The occupants, possibly as many as four, ran off.

One resident said she heard the crash and when she came outside saw the three victims lying on some grass.

"They were conscious, but they were crying and they were scared," said the resident, who did not want her name used.

Police are investigating the case as an assault and are trying to determine a motive.

Police and Crime Stoppers of Oakland are offering up to $7,500 in reward money for information leading to the arrest of the suspects. Anyone with information may call police at 510-238-3821 or a tip line at 510-773-2805.