OAKLAND -- A 1-year-old boy was briefly abducted Wednesday night by a gunman who carjacked his parents' vehicle at an East Oakland gas station, police said Thursday.

The boy was found unharmed a short time later about a half-mile away, and was reunited with the parents, police said.

The carjacking happened about 10:10 p.m. at a gas station at High Street and Foothill Boulevard.

Police said the parents and their three boys, including the 1-year-old, a 6-year-old and 11-year-old had stopped their 2002 Honda Odyssey minivan at the station to get gas. The 11-year-old was outside the vehicle pumping gas when a gunman approached and demanded everyone get out of the van, police said.

Everyone inside did, but the 1-year-old was still in his car seat in the rear of the van when the gunman drove off. The suspect might not have known the child was in the van when he drove off, police said.

At 10:41 p.m. a resident in the 4600 block of Ygnacio Avenue called police to report finding the child on the sidewalk in the car seat, covered with a sweatshirt.

The vehicle was still missing Thursday morning and no arrests have been made, police said. The Honda is silver and has a license plate of 6YLA720, police said.

Police and Crime Stoppers are offering up to $10,000 in reward money for information leading to the arrest of the suspect.

Anyone with information may call police at 510-238-3326 or a tip line at 510-773-2805.