At about 9:36 a.m. two black men in their 20s, both about 6 feet tall and wearing hooded sweatshirts and possibly wearing ski masks, entered the 2050 N. California Blvd. bank branch, and displayed automatic handguns, police reported.
One of the men stood in the lobby area while the other man walked up to a teller, handed the teller a bag and told the teller to put money in the bag.
The teller complied with the order and put an undisclosed amount of cash in the bag, police reported.
The second suspect then approached a second teller, handed over a second bag and gave the same order, police reported.
One of the men then told the other that it was "time" and they quickly left the bank.
They were seen getting into a 1998 to 2000 green, four-door Buick that was driven by a third suspect described only as a black male.
Walnut Creek police were notified of the robbery by the bank's "Hold-up" alarm, police reported. When police called the bank, employees confirmed that the bank had just been robbed.
Officers searched the area, but were unable to locate the suspects or their vehicle.
Anyone with information about the robbery is asked to call the Walnut Creek Police Department at (925) 943-5844.