​What we know about the gunman in Chattanooga attack

WASHINGTON -- Investigators have identified Mohammod Youssuf Abdulazeez, 24, as the gunman behind Thursday's attacks on military centers in Chattanooga, Tennessee. Four Marines were killed and another was wounded, along with a police officer.

Late Thursday investigators sealed off the home where law enforcement sources say Abdulazeez lived. It's located in Hixson, Tennessee, which is about two miles and a few minutes away from where the shootings occurred.

Federal law enforcement officials say Abdulazeez was born in Kuwait and became a naturalized U.S. citizen. His father is from Nablus in the West Bank and his mother is from Kuwait.

He was not on any U.S. terror list and the FBI was not aware of his having any terrorist leanings. Abdulazeez had been stopped by local police in April when he was booked for a DUI.

Officials will now go through his computers and any social media postings as they try to determine what motivated the gunman to act. The FBI's Ed Reinhold is leading the investigation.

"We're going to do an intense look at him to see what his connections are," said Reinhold. "We'll look at his friends, family, associates -- anybody who is associated with him to determine the cause or the reason why he conducted this attack."

Officials will try to find out if Abdulazeez was motivated or influenced by ISIS.

The group has been calling for "lone wolf" style attacks in the U.S. on the military and police during the month of Ramadan, which concludes Friday. Over the Fourth of July holiday, federal law enforcement officials warned of the potential for an attack.

At a news conference late Thursday night, Reinhold said so far, investigators had not uncovered evidence linking Abdulazeez with any international terror groups. He said there was "no indication" that anyone else was involved in the attack.

Homeland Security Secretary Jeh Johnson has called for increased security at "certain federal facilities," out of an abundance of caution.

A week ago FBI Director James Comey said agents had made arrests to thwart Fourth of July attacks, but also acknowledged the challenges of tracking the thousands who follow ISIS on social media.