A US soldier Naser Abdo, 21, accused of planning to attack troops near Fort Hood, Texas, has told investigators that he was acting in support of Major Nidal Hasan, the army psychiatrist charged in the killing of 13 people at the base in 2009.
He was arrested in Killeen, Texas, after authorities said they discovered bomb-making materials in his motel room, as well as a copy of an article from the al-Qaeda magazine Inspire, which is produced by the terrorist group's Yemen affiliate. His behaviour at a gun shop in the town had prompted its owners to contact police.
The officials said Abdo was planning to set off bombs at locations outside the base where soldiers gather and then to follow the explosions with gunfire.
''I would classify this as a terror plot,'' police chief Dennis Baldwin said in Killeen. Law enforcement officials said Abdo would be charged in federal court with possession of bomb-making materials, among other offences.
The emergence of another alleged plot to attack troops at the same base where Hasan is accused of striking may intensify fears that there is a growing terrorist threat from self-radicalised Americans and raise questions about whether the military can adequately identify internal threats. Hasan was arraigned in military court on capital murder charges but has not entered a plea.
A US official said authorities have not found any direct communication between Abdo and foreign Islamist extremists.
Attached to the the 101st Airborne Division at Fort Campbell, Kentucky, Abdo recently sought conscientious objector status because he felt that as a Muslim he could not be deployed to fight in a war zone.