The latest robbery was reported at about 1:30 p.m. Monday at the SF Fire Credit Union at 565 Buckingham Way. That came after another robbery at the same location on the afternoon of July 15, according to police.
In Monday's robbery, the woman entered the credit union and approached a teller, took out a gun and demanded money. The 19-year-old teller complied, and the woman fled with the cash.
Police believe the same woman robbed the credit union on July 15. That day, she was seen leaving in a white, two-door late-1990s car, possibly a Chevrolet.
She is described as a black woman in her mid to late 30s who is between 5 feet 5 inches and 5 feet 7 inches tall, weighs about 200 pounds, and has her hair in corn rows down to her neck, police said.
The woman was last seen wearing clear eyeglasses, a brown hooded sweatshirt with a zipper, blue jeans and dark shoes, and was armed with a handgun, according to police.
Monday's robbery prompted the credit union to close its doors Tuesday to allow employees to regroup. It will reopen at 11:30 a.m. today.
Anyone with information about the suspect or her whereabouts is asked to call the Police Department's anonymous tip line at (415) 575-4444 or send a tip by text message to TIP411.