A shooting at a military reserve center in Chattanooga, Tenn., left four Marines dead and three people injured, including a police officer, officials announced Thursday.
Mayor Andy Berke said the shooter was also killed.
The deadly attack was preceded by a shooting at a nearby military recruiting center where no one was injured.
"This is a sad day for the United States," William C. "Bill" Killian, U.S. attorney for the eastern district of Tennessee, said at a news conference. "These service members served their country with pride, and they have been the victims of these shootings.