NEW : The FBI says the shooter probably has grievance against the Marine Corps . NEW : A man who was shot and killed by police in a Florida mall is believed to have been carrying an assault rifle that he used at his workplace before killing himself. New bullet holes were found in the glass and metal structure of the building but not inside , Adams said . It is the second attack on the Marine Corps museum in recent days . Two other military buildings in the Washington area also have been fired upon .
NEW : The FBI says the shooter probably has grievance against the Marine Corps . NEW : A man who was shot and killed by police in a Florida mall is believed to have been carrying an assault rifle that he used at his workplace before killing himself. It is the second attack on the Marine Corps museum in recent days . Two other military buildings in the Washington area also have been fired upon .