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A shooting rampage Thursday afternoon at the Army's Fort Hood in Texas killed 11 and wounded 31 before the gunman was killed and two suspects taken into custody.

All three of the people believed to have carried out the shooting were soldiers, Lt. General Bob Cone told reporters Thursday evening, though the motive remains unclear.

AP cites an unnamed source saying the gunman was Major Malik Nadal Hasan, though authorities have not publicly identified him.

Cone said witnesses reported seeing more than one shooter, but that couldn't be confirmed. The primary shooter used two handguns, he said.

The shooting took place 1:30 p.m. Thursday at the post's Soldier Readiness Center, where soldiers undergo medical screening before being deployed or after returning from overseas.

"We have a terrible, tragic situation here," said Cone. "Soldiers, family members and the civilians that work here are absolutely devastated."

Cone said the injuries "vary significantly" among the victims wounded in the shooting. The victims include one civilian police officer.

George Stratton's son George Stratton III was five feet away from the shooter at the Soldier Readiness Center and suffered a gunshot wound to his left shoulder.

"I talked to him right before surgery. He said, 'Dad, I'm getting ready to go into surgery ... I love you,'" George Stratton told FoxNews.com.

It was the second time the 18-year-old from Idaho called his father after the shooting. The first time was a voice mail he left while in the ambulance on the way to the hospital.

"Dad, I've just been shot and going to be OK. I'm in an ambulance," he said in the message.

President Obama called the shooting a "horrific outburst of violence" on members of the nation's armed forces. "It is horrifying that they should come under fire at an army base on American soil."

He said he doesn't yet know all the details but promised the government would get "answers to every single question."

Texas Sen. Kay Bailey Hutchison said the shooting was a terrible tragedy for all of the military families affected.

The base and area schools were on lockdown after the mass shooting, and all those on the Army post were asked to gather for a head count.