An AWOL infantry soldier caught with weapons and a bomb inside a backpack admitted planning what would have been Fort Hood's second terrorist attack in less than two years, the Army said Thursday. He might have succeeded at carrying it out, police said, if a gun-store clerk hadn't alerted them to the man's suspicious activity.

"We would probably be here today, giving you a different briefing, had he not been stopped," Killeen Police Chief Dennis Baldwin said.

The 21-year-old suspect, Pfc. Naser Abdo, was arrested Wednesday at a motel about 3 miles from Fort Hood's main gate. He had spoken out against the 2009 Fort Hood shootings last year as he made a public plea to be granted conscientious objector status to avoid serving in Iraq or Afghanistan.

Like the soldier charged with killing 13 people in the shootings, Abdo is Muslim, but he said in an essay obtained by The Associated Press the attacks ran against his beliefs and were "an act of aggression by a man and not by Islam."

Abdo was approved as a conscientious objector this year, but that status was put on hold after he was charged with possessing child pornography. He went absent without leave from Fort Campbell, Ky., during the July 4 weekend.