( CNN ) -- A Southern California bank robber dubbed the `` geezer bandit '' has struck again , possibly knocking off his 11th bank , the FBI said . The suspect held up a Bank of America branch in Temecula on Thursday . `` During ( the ) robbery , the robber approached the victim teller and presented a demand note for cash , '' a statement from the FBI said . `` The robber carried a leather case which contained a small caliber pistol that he threatened to use , if the teller did not comply with his demands . '' The FBI believes the suspect is responsible for robbing 10 banks in San Diego County and one in Riverside County . The `` geezer bandit '' has carried a weapon in at least two of the robberies and should be considered dangerous , authorities said . `` In these types of crimes , the potential for violence is significant , '' April Langwell , spokeswoman for the San Diego office of the FBI , said in May . `` The last thing we want to happen is an employee of the bank or a customer to be injured as a result of one man 's greed . '' The robber has been described as between 60 and 70 years old . However , there has been some suggestion that he may be wearing a mask to conceal his real age and make him appear much older than he is , Langwell said . He is approximately 6 feet , 190 pounds , of average build and has been known to wear prescription eyeglasses and various hats and caps , including a blue baseball cap with a script style `` P '' on the front . CNN 's Greg Morrison contributed to this report .
`` Geezer bandit '' may have robbed up to 11 banks . Robber believed to be at least 60 years old . Comment: