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A shooting at Fort Hood military post in Texas killed 11, wounded as many as 31, and left the gunman dead, the Army said.

The shooter was killed and two other suspects were in custody, Lt. General Bob Cone said. All three were U.S. soldiers.

Cone said witnesses reported seeing more than one shooter.

The shooting took place 1:30 p.m Thursday at the post's Soldier Readiness Center where soldiers who are about to be deployed or who are returning undergo medical screening.

"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."

A motive wasn't immediately known.

The victims were a mix of civilian and military, officials said.

The FBI ruled out terrorism.

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.