A bank robbery on San Francisco's Union Street went beyond the typical "hand note to teller" scenario Monday, when the solo thief stormed the financial institution's vault.

According to the San Francisco Police Department, at 12:20 yesterday afternoon, a male suspect entered a bank on the 200 block of Union Street, which is between Montgomery Street and Calhoun Terrace. (Note: A look on Google Maps does not show any banks on that block, but a call to SFPD to double-check the block on which the crime occurred was not returned at publication time.)

Once inside, the man, who police say was armed with a handgun, demanded cash from a 40-year-old bank teller.

He then "jumped over the counter and entered into the vault," police say, taking an undisclosed amount of "currency from the vault and teller drawers" before fleeing on foot.

No one was injured in the robbery, according to the SFPD. No arrests have been made in this case, and the bank robber, police say, remains at large.