Here are details from a Walnut Creek police press release:
On February 29, 2012 at about 9:30 AM the suspect entered Bank of the West on California Blvd. and demanded cash from the teller. The suspect was given an undisclosed amount of money from the teller and then fled the bank. He was last seen walking northbound on California Boulevard. No weapons were seen. Officers searched the area, but were unable to locate the subject. Anyone with information is encouraged to call WCPD at 925-943-5844.