NEW : The FBI says the shooter probably has threats against the Marine Corps . NEW : Federal officials say they want to talk with the shooter about complaints . The shots probably came from the interstate , said Maj. It is the second attack on the Marine Corps base in recent days . Several other military buildings in the Washington area also have been fired upon .
NEW : The FBI says the shooter probably has threats against the Marine Corps . NEW : Federal officials say they want to talk with the shooter about complaints . It is the second attack on the Marine Corps base in recent days . Several other military buildings in the Washington area also have been fired upon .