Update at 11:57 a.m. ET:
The AP is now reporting confirmation from the FBI that Abdo had "items that could be identified as bomb-making components, including gunpowder" when he was arrested.
Our original post:
An AWOL soldier from Fort Campbell, Ky., has been arrested in Killeen, Texas, near Fort Hood. Army Pfc. Naser Abdo was being held Thursday, a day after his arrest by local police at a motel in the central Texas town.