OAKLAND -- Four house painters, on the job for just a few hours at a North Oakland residence, were robbed at gunpoint Monday afternoon, police said.

One painter was ordered off a ladder by the robbers, who took cellphones, wallets and other items. The victims, who range in age from their 30s to 50s, were not injured.

The robbery happened about 12:30 p.m. Monday in the 4900 block of Webster Street. It was the first day at the house for the veteran painters, all Oakland residents.

They started work about 8:30 a.m. and had finished their lunch break about 12:30 p.m. when two men, one armed with a gun, walked up and demanded their valuables, Officer Sven Hamilton said.

While the gunman held the four at bay, the other robber went to each one of them and took the various items, police said.

The robbers then fled, possibly in a maroon-colored vehicle seen going south on Webster.

The gunman was described as black, in his 30s, about 5 feet, 7 inches tall and 185 pounds wearing a gray hooded sweatshirt and blue jeans. Police and Crime Stoppers of Oakland are offering up to $2,500 in reward money for information leading to the arrest of the robbers. Anyone with information may call police at 510-238-3326 or a tip line at 510-773-2805.