OAKLAND -- A 17-year-old boy and a man have been arrested on suspicion of robbing 10 casual carpoolers in Rockridge on Monday morning, police said Tuesday.

Both suspects have been identified as the robbers by some of the victims, and the 17-year-old Oakland boy, whose name was not released, admitted his involvement, Sgt. Todd Mork said.

Police served a search warrant at the 17-year-old's West Oakland home and recovered three pistols, including one believed used in the robberies, Mork said.

The other suspect, 22-year-old Delante Johnson, of Oakland, has denied being involved, police said.

The victims were among more than a dozen men and women standing in line in the 400 block of Hudson Street near Claremont Avenue under Highway 24 about 8:55 a.m. Monday, waiting for carpool rides to San Francisco, when three males wearing hooded sweatshirts approached them on foot and demanded their valuables.

One of them, believed to be the teenager, had a gun, and nine people were robbed of backpacks, cellphones, iPhones, purses and wallets, police said. Another man did not lose anything to the robbers, police said.

The robbers fled in a silver Honda and a witness was able to get a partial license plate.

Officers Chris Crabtree and Luis Espinoza stopped the car in the 2900 block of San Pablo Avenue about 11:30 a.m. The boy and Johnson were detained and taken to police headquarters after some victims brought to the site were able to identify them, police said. A third man in the car was questioned and released at the scene.

None of the property taken from the victims has been recovered. Police believe some of the stolen electronic items may have been sold to other people before the car was stopped.

Mork said the suspects did not decide to rob the carpoolers until they saw them standing in line. "It was more a crime of opportunity," he said. He said police are investigating if the two have been involved in other robberies.

Both the boy and Johnson were arrested on multiple counts of armed robbery. Police said the district attorney's office will decide if the boy will be prosecuted as an adult on in juvenile court.