FORT HOOD, Texas -- The U.S. Army says 12 people have been killed and 31 wounded in a shooting rampage on the Fort Hood Army base in Texas.

In a news conference Thursday afternoon Lt. Gen Bob Cone said one shooter had been killed and two suspects were apprehended on Thursday. However, Thursday Night Cone said the shooter had only been wounded.

The shooting began around 1:30 p.m. Cone says that all the casualties took place at the base's Soldier Readiness Center where soldiers who are about to be deployed or who are returning undergo medical screening.

He says the primary shooter used two handguns in the attack.

Military officials say the suspected shooter at Fort Hood was a psychiatrist at Walter Reed Army Medical Center for six years before being transferred to the Texas base in July.

The officials had access to Maj. Nidal Malik Hasan's military record. They said he received a poor performance evaluation while at Walter Reed.

The officials spoke on condition of anonymity because military records are confidential.

The Virginia-born soldier was single with no children. He was 39 years old.

He is a graduate of Virginia Tech University, where he was a member of the ROTC and earned a bachelor's degree in biochemistry in 1997. He received his medical degree from the military's Uniformed Services University of the Health Sciences in Bethesda, Md., in 2001. At Walter Reed, he did his internship, residency and a fellowship.

Sen. Kay Bailey Hutchison says the Army major accused of the shooting was about to deploy overseas.

Hutchison says she was told about the upcoming deployment by generals based at Fort Hood. But it was unclear if he was headed to Iraq or Afghanistan and exactly when he was scheduled to leave.