CHATTANOOGA, Tenn. (AP) - The FBI said it is treating the Chattanooga gunman as a "homegrown violent extremist" and that it is too early to determine if he had been radicalized.
Ed Reinhold, the FBI's special agent in charge in Knoxville, said during a news conference Wednesday that investigators were still looking into whether Muhammad Youssef Abdulazeez had been radicalized.
Reinhold says authorities believe Abdulazeez acted alone, without the assistance of anyone else when he attacked two military sites in Tennessee on Thursday.
Four Marines and a Sailor were killed in the attack which latest fewer than five minutes.
Reinhold said a service member fired at the shooter after he crashed his rented, silver Mustang convertible through the gates of a joint Marine-Navy facility.
Reinhold said Abdulazeez went inside the building looking for victims. At this point 20 Marines and 2 Sailors were inside and went into active shooter mode, leaving the building. But they knew the fight was not over.
"Once they had gotten to safety, some willingly ran back into the fight. All of us can be extremely proud of what our Marines did that day," said Major General Paul Brier from the 4th Marine Division.
A serviceman inside the building died, another Marine was injured.
Once making his way through the building, Abdulazeez went out the back into the motor pool area where he gunned down four Marines.
The FBI continues to investigate the motive behind this attack.
"At this time we're treating him as a homegrown violent extremist. We believe he acted on his own that day. We believe he entered the facility on his own. We do not have any indication anyone else was assisting him on that day," Special Agent Reinhold continued.
It was gunfire from the Chattanooga Police that finally stopped the shooter.
Funeral services have been finalized for two of those killed.
David Allen Wyatt's funeral will be Friday in Hixon, Tennessee. He will be laid to rest at the Chattanooga National Cemetery.
Randall Smith's funeral will be Tuesday. He will also be buried at Chattanooga's National Cemetery.
(The Associated Press contributed to this report.)
