A man claiming to be armed with a grenade walked into the California Bank and Trust on Wall Street in La Jolla on Monday morning and demanded cash from a teller. The man, described as about six feet tall and in his 70s, told the teller that he would shoot if he were handed a dye pack (a stack of money armed with a device intended to mark stolen bills by exploding a pack of ink hidden inside the stack). As he fled the bank, he placed something under a mat, which he claimed was a grenade. Investigators, who do not believe the theft was related to the Geezer Bandit series of robberies, were quoted in several published reports as saying the man was last seen walking east toward Ivanhoe Avenue and was wearing tan pants, a tan fisherman’s hat, a red sweater and sunglasses.