FORT HOOD, Texas (AP) - One soldier at Fort Hood says troops are constantly ready for battle while deployed, but cannot defend themselves while on post.

The Army says a mental health doctor opened fire at a medical screening center, killing at least 12 others and wounding dozens more.

The gunman has been identified as Major Nidal Malik Hasan.

It was unclear what the motive was, though it appeared Hasan was
upset about a scheduled deployment. U.S. Sen. Kay Bailey Hutchison
says military officials told her the Army major was about to be
deployed overseas.

The Army says two soldiers taken into custody were released because they were not involved.

(Copyright 2009 by The Associated Press. All Rights Reserved.)