At least four people are dead and 16 others injured after a mass shooting at Fort Hood in Texas. Thursday morning, we're learning more about the mental state of the alleged shooter before he opened fire.
Sources tell CBS News the suspect is 34-year-old Ivan Lopez. Army officials say the suspected shooter was an Iraq war veteran and doctors were assessing whether he had post-traumatic stress disorder.
"While we do not know a motive, we do know that this soldier had behavioral health and mental health issues and was being treated for that," an Army official said.
The Texas Army Post was thrown into lockdown Wednesday afternoon after Lopez allegedly opened fire in two buildings and from a vehicle with a semiautomatic pistol he had recently purchased. Officials say military police confronted the shooter in the parking lot and that's when he shot himself. The injured were rushed to local hospitals.
"They've had a variety of injuries that we've been treating, ranging from gunshot wounds that had involved extremities abdomen, chest and neck," Dr. Glen Couchman, Chief Medical Officer at Scott & White Healthcare, said.
Wednesday's shooting is bringing back painful memories of a similar incident in 2009 when Army psychiatrist Nidal Hasan killed 13 people here at the post. Some are questioning whether security improvements put in place since then are enough.
President Obama said he's heartbroken that Fort Hood is going through this again and pledged the government will get to the bottom of what happened.
Investigators are still searching for a motive but say it does not appear this incident was related to terrorism.