An investigation into a Friday afternoon Bank robbery continues this morning. San Luis Obispo Police say a male suspect walked into the U.S. Bank on South Higuera Street late Friday afternoon. He was wearing dark clothing, an “old man” mask, and sunglasses. Investigators say he did not display a weapon and did not threaten to have one. He got away with an undisclosed amount of cash. Anyone with helpful information about this ongoing investigation is asked to contact the San Luis Obispo P.D…