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MORE DETAILS: Fort Hood shooting
TEXAS -- The soldier who killed three people and wounded 16 others at Fort Hood before taking his own life, may have argued with another service member prior to the attack.
The base leader and other investigators believe Ivan Lopez was unstable and that that contributed to the rampage.
Troops aren't allowed to carry weapons on the Army base, so authorities are investigating how Lopez managed to get a semi-automatic handgun onto Fort Hood.
ABC's Mary Bruce is on the Army post and has the latest on the investigation.
"All units we have an active shooter currently on Ft Hood coming in from the mortiful area"
The 911 calls came pouring in it was 4 pm on Wednesday and Army Specialist Ivan Lopez had opened fire on his fellow soldiers.
"We also have some people escaping through the windows."
Emergency responders rushed to the scene as Lopez continued shooting, killing three. wounding 16. We are going to need to escort for blood.
Is it a patient or is it a blood run? It's going to be a blood run."
Out of the chaos, heroism. Lopez was confronted by a female military police officer. After she fired at him, he took his own life.
Among the dead -- SFC Danny Ferguson. His fianc telling Florida station WTSP he gave his life to save others, blocking a door that wouldn't lock.
If he was not against that door holding it, that shooter would have been able to get through and shoot everyone else."
Also among the dead, Sgt Timothy Owens His mother heartbroken 'very terrible that they had to shoot my son he was a good person.."
Lopez was tackling mental and emotional health issues he was last seen by a psychiatrist a month ago but the Pentagon insists there were no warnings of the violence to come.
"No indication on the record of that exam that there was any of a sign of likely violence either to himself or others."
Investigators believe Lopez may have argued with another soldier here just before the shooting but say there is no evidence he was targeting