Surveillance videos show a thin, gray-haird man who appears to be in his 70s wearing a hat and sunglasses.
LinkHis most recent robbery was just this past Monday, when he approached a teller at a Bank of America in La jolla, California, and showed her a gun. He handed her a note demanding cash before fleeing on foot.
Police believe he has hit four other banks since August 28th. At one heist, he was spotted carrying an oxygen tank, with tubes going up into his nose.
Officials are offering $16,000 for information that leads to his arrest. Because of his gun, they do consider him armed and dangerous, and ask citizens not to approach him if spotted.