Four Marines were killed today when a gunman opened fire at two separate military centers in Chattanooga, Tennessee.

The suspect, who was also killed, has been identified as 24-year-old Muhammad Youssef Abdulazeez.

According to AP, he is from Kuwait and lived in Hixson, Tennessee, which is just a few miles across the river from Chattanooga.

The photo below is a booking photo released by Hamilton County Sheriffs Office after he was detained for a driving offense this past April. 

Law enforcement officials are treating the attacks as an act of domestic terrorism.

Reports indicate that Abdulazeez was not on the FBI's radar leading up to the attacks. 

(See full updates, here.)

Watch the video above to hear the latest on the investigation. 

UPDATES: 4 Marines Killed in Attacks on 2 Chattanooga Military Centers

Chattanooga Shooter Identified as Muhammad Youssef Abdulazeez