As the country mourns the deaths of five service members gunned down in Tennessee, investigators in both the United States and Jordan are trying to learn what prompted the attack.
Mohammad Abdulazeez first shot up a military recruiting center at a Chattanooga strip mall, then drove to local Navy operations support center and launched another attack, killing four Marines and a Navy sailor. He died in a gunfight with law enforcement.
A spate of new details have emerged over the past few days. Among them:
- Mohammad Abdulazeez suffered from depression and "was not the son we knew and loved," his family said in a written statement over the weekend. "We extend our deepest sympathies and condolences to the families of the honorable servicemembers and police officers who were victims of the shooting our son committed on Thursday." A police officer was among the wounded in the shooting.
- The family has also told investigators that the 24-year-old had been abusing drugs for some time, according to a source familiar with the family's interviews with investigators. The drugs reportedly included "party drugs" and marijuana.
- Abdulazeez's family sent him away to Jordan last year to get him away from Chattanooga friends who they said were bad influences on him, the relatives told investigators.
Palestinian village affected by Tennessee killings 03:28
- Some of Abdulazeez's relatives and friends told investigators they detected changes in his behavior since he returned from Jordan last year, a law enforcement official said.
- Jordanian security investigators have interviewed Abdulazeez's extended family, asking them where he went and whom he spoke with on his trip, government sources there told CNN.
- Authorities are investigating a text message from Abdulazeez to a friend before the attack, law enforcement sources said. The message said: "Whoever shows enmity to a friend of Mine, then I have declared war against him."
- Abdulazzeez had a hard time keeping a job because of his manic depressive/bipolar disorder and drug use, for which he had sought treatment for with a psychiatrist, according to the source familiar with the family's interviews.
- "It grieves us beyond belief to know that his pain found its expression in this heinous act of violence," the Abdulazzeez family said in their statement.
Muslim community condemns Chattanooga shooting 04:07
But CNN law enforcement analyst Tom Fuentes stressed that depression doesn't necessarily make anyone more likely to kill.
"I think mental health professionals would be not happy with what the parents are assessing, in saying, 'Well, he was depressed, and therefore that's why he became a killer like this,'" Fuentes said. "People with depression do not turn, necessarily, into psychopathic killers -- as he did."
U.S. Attorney Bill Killian said the shootings are being investigated as an "act of domestic terrorism," but he noted the incident has not yet been classified as terrorism.
And so far, there is nothing connecting the attacker to ISIS or other international terror groups, said Ed Reinhold, special agent in charge of the regional FBI office. Abdulazeez was not on any U.S. databases of suspected terrorists.
Boosting security
Deadly shooting in Chattanooga, Tennessee 12 photos
Some governors are increasing security measures for National Guard recruiters and military facilities in their states. And several have called for armed National Guard members.
Florida Gov. Rick Scott ordered National Guard members at six state recruitment centers to be relocated to armories until security is improved. In addition, qualified Guard members will be armed.
Texas Gov. Greg Abbott has called for armed National Guard personnel at military facilities throughout the state.
And Oklahoma Gov. Mary Fallin authorized the arming of certain full-time personnel in military installations throughout the state.
"It is painful enough when we lose members of our armed forces when they are sent in harm's way," she said in a statement. "But it is unfathomable that they should be vulnerable for attack in our own communities."
