FORT HOOD, Texas (AP) — The soldier who killed three people at Fort Hood may have argued with another service member prior to the attack, and investigators believe his unstable mental health contributed to the rampage, authorities said Thursday.
The base's senior officer, Lt. Gen. Mark Milley, said there is a "strong possibility" that Spc. Ivan Lopez had a "verbal altercation" with another soldier or soldiers immediately before Wednesday's shooting, which unfolded on the same Army post that was the scene of an infamous 2009 mass shooting.
However, there's no indication that he targeted specific soldiers, Milley said.
Lopez never saw combat during a deployment to Iraq and had shown no apparent risk of violence before the shooting, officials said.
The 34-year-old truck driver from Puerto Rico seemed to have a clean record that showed no ties to extremist groups. But the Army secretary promised that investigators would keep all avenues open in their inquiry of the soldier whose rampage ended only after he fired a final bullet into his own head.
"We're not making any assumptions by that. We're going to keep an open mind and an open investigation. We will go where the facts lead us," Army Secretary John McHugh said, explaining that "possible extremist involvement is still being looked at very, very carefully."
Investigators were also looking into Lopez's psychological background. He had sought help for depression, anxiety and other problems, military officials said.
"We have very strong evidence that he had a medical history that indicates unstable psychiatric or psychological condition," Milley said. "We believe that to be a fundamental underlying cause."
Scott & White Memorial Hospital in nearby Temple, Texas, was still caring for several of the 16 people who were wounded. All of them were in either serious or good condition, and some could be discharged before the end of Thursday.
Hospital officials had no information about patients being treated elsewhere, including at a base hospital. But because Scott & White is the area's only trauma center, the patients with the most serious injuries were probably taken there.
Investigators searched the soldier's home Thursday and questioned his wife, Fort Hood spokesman Chris Haug said.
Lopez apparently walked into a building Wednesday and began firing a .45-caliber semi-automatic pistol. He then got into a vehicle and continued firing before driving to another building. He was eventually confronted by military police in a parking lot, Milley said.
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