(NBC News) Federal agents and army investigators are searching for answers after a soldier opened fire at Fort Hood Wednesday, killing three and injuring 16 before turning his gun on himself.
"He walked into one of unit buildings opened fires got in vehicle fired from vehicle got out walked into other building and opened fire again," confirmed Lt. General Mark Milley.
The suspect has been identified by military sources as 34-year-old Army Specialist Ivan Lopez.
Lopez was undergoing diagnostic testing for post traumatic stress disorder prior to the shooting.
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Authorities say the gunman who opened fire at Fort Hood, killing three people and himself, was an Iraq War veteran being treated for mental illness.
Wednesday's attack also wounded 16 people at the Texas military base, where a 2009 shooting rampage killed 13 people and wounded more than 30.
A federal law enforcement official says investigators will interview the gunman's wife, search his home, and examine whether his combat experience caused lingering psychological trauma.
The official, who spoke to The Associated Press on condition of anonymity, says investigators also must find witnesses who know what the shooter said and did during the attack.
Fort Hood's senior officer, Lt. Gen. Mark Milley, says the gunman had sought help for depression and anxiety, and was being assessed for post-traumatic stress disorder.
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Law enforcement officials say 4 people killed in Fort Hood shooting, including the gunman.
Fort Hood confirmed the shooting on the base in a brief statement Wednesday evening. The statement also said emergency crews were on the scene and that further details were not yet known.
The official says reports circulating within the Justice Department indicate the shooter has died of what appears to be a self-inflicted wound. The official spoke on the condition of anonymity because the investigation is still ongoing.
President Barack Obama says the government will get to the bottom of what happened in a shooting incident at Fort Hood.
Obama says he's following the situation closely but that the situation is fluid. He says officials are doing everything they can to make sure everyone is secure.
Obama says the incident brings back painful memories of the 2009 mass shooting at Fort Hood. He says, quote, "We're heartbroken that something like this might've happened again."
Obama says people at Ford Hood have sacrificed so much for freedom and their sense of safety has been broken once again.
Obama's comments come as U.S. officials say one person is dead and 14 wounded at the Texas Army base.
Obama spoke at a restaurant in Chicago where he held a fundraiser.
A senior U.S. defense official says one person is dead and 14 wounded in a shooting at Fort Hood.
The official spoke on condition of anonymity because the official was not authorized to discuss the information publicly.
The Texas Army base was the scene of a mass shooting in 2009. Thirteen people were killed and more than 30 wounded in what was the deadliest attack on a domestic military installation in history.
Fort Hood says there's been a shooting at the Texas Army base and that there have been injuries.
The base posted a statement online Wednesday. It said emergency crews are on the scene. No further details are known.
The base was the scene of a mass shooting in 2009. Thirteen people were killed and more than 30 wounded in what was the deadliest attack on a domestic military installation in history.
Copyright 2015 by The Associated Press. All Rights Reserved.