(CNN) -- A federal grand jury in Waco, Texas, on Tuesday indicted Pfc. Naser Jason Abdo, the AWOL soldier accused of plotting an attack on Fort Hood soldiers, officials said.
Abdo, 21, was charged with possession of an unregistered destructive device as well as possession of a firearm and ammunition by a fugitive.
"The three-count indictment specifically alleges that on July 27, 2011, Abdo was in possession of a destructive device not registered to him in the National Firearms Registration and Transfer Record as well as a .40-caliber semi-automatic pistol and 20-gauge shot shells while being a fugitive from justice," a statement from the U.S. Attorney's Office Western District of Texas read.
Abdo is a Muslim American paratrooper who had been granted conscientious objector status after he refused to deploy to Afghanistan. In May, he was charged with possession of child pornography on his computer, according to the Army, and he has been absent without leave since June.
A call to Abdo's attorney seeking comment Tuesday was not immediately returned.
Abdo was arrested in July in Killeen, Texas. At a probable cause hearing, federal agents told Magistrate Judge Jeffrey Manske that he had been plotting a bomb attack and that material found in his motel room could be used to assemble bombs.
Specifically, Abdo was found to be in possession of a handgun, six bottles of smokeless gunpowder, shotgun shells and pellets, two clocks, two spools of auto wire, an electric drill and two pressure cookers.
Authorities also found an article titled, "Make a bomb in the kitchen of your Mom," in his backpack.
FBI Special Agent Michael Brogan testified that Abdo admitted he was planning a massive bomb attack against Fort Hood -- the largest U.S. Army post.
Abdo remains in federal custody. If convicted, he could face up to 10 years in federal prison and a maximum $250,000 fine per count.