Police are searching for the man who implied he was armed as he robbed the Lafayette Walgreens store, 3614 Mt. Diablo Boulevard, of cash Friday morning.
The robbery was reported at approximately 9:50 a.m.
The suspect is described as a black male, heavy set, black ski mask, red coat, green pants. He was last seen wearing a green hat with a yellow emblem on the front.
Police are stopping BART trains to search for suspect. No weapon was actually seen.
An ambulance has been called to the store to check on a worker reportedly assaulted during the robbery.