Khalid Ali-M Aldawsari, who was legally in the U.S. on a student visa, was arrested in February 2011 after federal agents secretly searched his apartment near Texas Tech University in Lubbock and found bomb-making chemicals, wiring, a hazmat suit and clocks.
Authorities also discovered Aldawsari's journal, handwritten in Arabic, in which he wrote he'd been planning a terror attack in the U.S. for years and that it was "time for jihad," or holy war, court documents show.
He faces up to life in prison. Sentencing is scheduled for Oct. 9 in Amarillo.
After the jury left the courtroom Wednesday, Aldawsari, 22, sat with his attorneys before being led off by U.S. Marshals. Prosecutors left the courtroom declined to comment.
His attorneys claimed that because Aldawsari didn't have a bomb made or a target pinpointed, he couldn't have attempted to use a bomb.
"It's always disappointing when you lose but at the same time, it was a very difficult case at the outset," defense attorney Dan Cogdell said Wednesday. "We did the best we could under the circumstances."
Cogdell said Aldawsari was likely to appeal the verdict at some point. He described his client as "the antithesis of what you'd expect him to be."
On Feb. 1, 2011, Carolina Biological Supply of Burlington, N.C., a chemical company, reported a suspicious $435 order by Aldawsari to the FBI.
Separately, Con-way Freight, the shipping company, notified Lubbock police and the FBI the same day with similar suspicions because it appeared the order wasn't intended for commercial use.
Diego G. Rodriguez, the FBI special agent in charge for the region, credited both companies for calling authorities.
"You have our deepest and everlasting respect and gratitude for calling the FBI when you learned that the chemicals ordered and shipped were suspicious," Rodriguez said.
Within weeks, federal agents had traced Aldawsari's other online purchases, discovered extremist Internet posts and secretly searched his off-campus apartment, computer and email accounts and read his diary, according to court records.
President Barack Obama was notified about the plot before Aldawsari's arrest.
TNP, the chemical explosive that Aldawsari was suspected of trying to make, has approximately the same destructive power as TNT. FBI bomb experts said the amounts in the Aldawsari case would have yielded almost 15 pounds of explosives -- about the same amount used per bomb in the London subway attacks that killed scores of people in July 2005.
Aldawsari entered the U.S. in October 2008 from Riyadh, Saudi Arabia, to study chemical engineering at Texas Tech, then transferred in early 2011 to nearby South Plains College, where he was studying business. A Saudi industrial company was paying his tuition and living expenses in the U.S.