Authorities investigating this week's deadly shooting spree at Fort Hood said Friday that an altercation between Spc. Ivan Lopez and his fellow soldiers, rather than a medical condition, may have led to Lopez opening fire.
"The immediate precipitating factor was more likely an escalating argument in his unit area," Lt. Gen. Mark Milley, the post's commanding general, told reporters.
Some of the soldiers involved in the altercation were victims in the shooting, according to Chris Grey, spokesman for the U.S. Army Criminal Investigation Command, who appeared with Milley at a news conference on the sprawling post.Officials would not release further details about the argument, saying the investigation was still ongoing into what caused the 34-year-old to set out on a shooting spree that left three soldiers dead and 16 wounded before he killed himself.
But the sister of one of the soldiers injured in the attack said that prior to the shooting Lopez stopped by the base's personnel office to pick up a form requesting leave -- or military permission to be away for a time.
When he first heard about the shooting, Davis says one thought ran through his mind: "How can this possibly happen again?"
Less than five years ago, the hospital where Davis works treated casualties after Army Maj. Nidal Malik Hasan killed 13 people and wounded 32 more in a November 2009 shooting at Fort Hood.
Hasan was convicted of 13 counts of murder and 32 counts of attempted murder, and a military jury recommended in August that he be put to death.
The former military psychiatrist told a court he was on a terrorist mission to protect leading members of the Taliban.
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