OAKLAND -- Eight construction workers renovating an apartment in West Oakland were robbed at gunpoint Monday afternoon, police said.

The men were working at a vacant two-story fourplex in the 600 block of 23rd Street underneath Interstate 980 when four suspects, at least three of them armed with guns, got out of a car and robbed them, authorities said. None of the victims, who ranged in age from their 20s to their 40s, were injured, but were robbed of their wallets, cash and cellphones about 2:45 p.m.

The suspects fled in the car and are being sought by police. Investigators were told that it was the first day at the site for some of the workers.

The incident is the latest in a string of Oakland construction site holdups, following the robbery of a group of house painters Nov. 18 in the 4900 block of Webster Street and that of two construction workers Dec. 9 at a Rockridge home. On Oct. 1, an eight-person Habitat for Humanity crew was robbed and one of them shot at the Brookfield Court development in the 9500 block of Edes Avenue in East Oakland.

Police and CrimeStoppers of Oakland are offering up to $7500 in reward money for information leading to the arrest of the suspects. Anyone with information can contact 510-238-3326 or CrimeStoppers at 510-777-8572.