It will be weeks or perhaps months before the investigation concludes into what some authorities have called an "act of terrorism" at two military recruiting stations in Chattanooga, Tenn., on Thursday.
A man identified as Mohammod Youssuf Abdulazeez, 24, opened fire without warning from his car with a number of weapons. Four Marines were killed and two others and a police officer were injured in the attack.
Abdulazeez, a naturalized American citizen from Kuwait, died in a battle with local law enforcement soon after.
The attack is the third act of domestic terrorism carried out on U.S. military facilities since 2009. A fourth attack not considered an act of...