The investigation behind the motive of an Iraq War veteran who opened fire at Fort Hood, killing three people and wounding 16 before committing suicide is underway.
The gunman has been identified as Ivan Lopez.
Overnight, investigators were combing through Lopez's military background and personal life. That includes going through the hard drives of his personal computer and interviewing his wife.
Lopez, was from the U.S. territory of Puerto Rico and joined the Island's National Guard in 1999. He left the guard in 2010 to join the U.S. Army.
He arrived at Fort Hood from another Army Post in February.
According to published reports from the Associated Press. Lopez, apparently walked into two buildings on Wednesday afternoon and began firing a .45-caliber semi-automatic pistol. He was eventually confronted in a parking lot by a military police officer. When the officer drew their weapon, Lopez reportedly put his gun to his head and pulled the trigger.
Chairman of the House Homeland Security Committee, Texas Representative Michael McCaul, spoke on FOX 26 morning news and said this latest Fort Hood incident "demonstrates how soft our military bases still are. They are still a target not only of terrorists but possibly those with PTSD issues."
During a news conference outside the gates of Fort Hood on Wednesday, Fort Hood's senior officer, Lt. Gen. Mark Milley, said Lopez had sought help for depression, anxiety and other problems but had not been diagnosed with PTSD.
PTSD has been linked to depression and suicidal thoughts but not homicidal ones.
According to military records, Lopez was never wounded in action but had a self diagnosed head injury after serving four months in Iraq in 2011.
On Thursday morning the Army Secretary says Fort Hood shooter never saw combat in Iraq.
The April 2 shooting comes five years after another attack on Fort Hood in which Army psychiatrist Nidal Hasan killed 13 people and wounded 30 others on what ended up being ruled a terrorist attack.
Hasan is paralyzed from the waist down and on death row at the military prison at Fort Leavenworth in Kansas. During his trial he said he acted to protect Islamic insurgents abroad from American aggression.
Congressman McCaul says our "military are utterly defenseless to these types of shootings and so I think congress is going to be taking a look at this. We know the threats to our military bases are real."
The most recent shooting at a U.S. military instillation happened in September when a former Navy man opened fire at the Washington Navy Yard. 13 people were killed in that attack.
After that shooting, Defense Secretary Chuck Hagel ordered the Pentagon to review security at all U.S. defense installations worldwide. Following this latest incident at Fort Hood, Hagel said " obviously when we have these kinds of tragedies on our bases, something's not working."