TERROR

Little is known about man authorities say fatally shot 4 marines in Chattanooga rampage

  • A police officer ducks under tape near a memorial in front of an Armed Forces Career Center on Thursday, July 16, 2015, in Chattanooga, Tenn. A gunman unleashed a barrage of fire at the center and another U.S. military site a few miles apart in Chattanooga, killing several and sending service members scrambling for cover as bullets smashed through the windows. The attacker was also killed. (AP Photo/John Bazemore)

    A police officer ducks under tape near a memorial in front of an Armed Forces Career Center on Thursday, July 16, 2015, in Chattanooga, Tenn. A gunman unleashed a barrage of fire at the center and another U.S. military site a few miles apart in Chattanooga, killing several and sending service members scrambling for cover as bullets smashed through the windows. The attacker was also killed. (AP Photo/John Bazemore)  (The Associated Press)

  • In this aerial image taken from video, law enforcement personnel work the scene of a shooting at the Navy Operational Support Center and Marine Corps Reserve Center Chattanooga Thursday, July 17, 2015, in Chattanooga, Tenn. Authorities say Kuwait-born Muhammad Youssef Abdulazeez, 24, of Hixson, Tenn., unleashed a barrage of gun fire from his car at a recruiting center and the U.S. military site, killing at least four Marines before he was shot to death by police. (WTVF via AP) MANDATORY CREDIT, NO SALES

    In this aerial image taken from video, law enforcement personnel work the scene of a shooting at the Navy Operational Support Center and Marine Corps Reserve Center Chattanooga Thursday, July 17, 2015, in Chattanooga, Tenn. Authorities say Kuwait-born Muhammad Youssef Abdulazeez, 24, of Hixson, Tenn., unleashed a barrage of gun fire from his car at a recruiting center and the U.S. military site, killing at least four Marines before he was shot to death by police. (WTVF via AP) MANDATORY CREDIT, NO SALES  (The Associated Press)

  • Chuck Hartung holds his daughter Haley, 8, during a prayer service at Wesley Memorial United Methodist Church for the victims of shootings at a recruiting center and another U.S. military site a few miles apart in Chattanooga, Tenn., Thursday, July 16, 2015. Federal authorities said they were investigating the possibility it was an act of terrorism, and the FBI took charge of the case. (AP Photo/John Bazemore)

    Chuck Hartung holds his daughter Haley, 8, during a prayer service at Wesley Memorial United Methodist Church for the victims of shootings at a recruiting center and another U.S. military site a few miles apart in Chattanooga, Tenn., Thursday, July 16, 2015. Federal authorities said they were investigating the possibility it was an act of terrorism, and the FBI took charge of the case. (AP Photo/John Bazemore)  (The Associated Press)

The man who investigators say fatally shot four marines at a Navy-Marine training center and opened fire at a military recruiting center in Tennessee had a bachelor's in engineering and was an outgoing, popular student in high school who belonged to the wrestling team.

But beyond that, not much is known about Muhammad Youssef Abdulazeez of Hixson, Tennessee, or what motivated his rampage.

Federal authorities are looking into the possibility it was an act of terrorism, but say there's no evidence yet that anyone else was involved. The shooter was also killed.

A U.S. official says there was no indication Abdulazeez was on the radar of federal law enforcement before the shootings. The official wasn't authorized to discuss the case and spoke on condition of anonymity.