Waltham police are searching for two armed men who posed as FBI agents in a home break-in and assault Saturday night. Police said the assailants knocked on the door of a Bedford Street apartment about 11:30 p.m., said they had an FBI search warrant, and pistol-whipped a man when he opened the door. After they hit the victim several times in the head and demanded money, the victim told the assailants he had called 911. The assailants fled the apartment without taking anything from the home. Police said the assailants were wearing masks at the time of the attack but were believed to be in their mid-20s. The victim was treated at a local hospital for head injuries and released.
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