Mohamed Mohamud has been found guilty of trying to use a weapon of mass destruction in Portland.
A jury delivered the verdict at 3 p.m. Thursday, one day after attorneys made their closing arguments.
Mohamud's sentencing is scheduled for May 14.
Mohamud, 21, was arrested after the FBI said he attempted to detonate a fake bomb during Portland's Christmas tree-lighting ceremony in November 2010. The fake bomb was supplied by FBI agents posing as al-Qaida recruiters.
Greg Fowler, special agent in charge of the FBI's Portland division, issued a statement after the verdict was announced saying the jury decided Mohamud's fate, "while balancing the needs for safety and justice."
"His actions showed little regard for the rights and responsibilities that come with being an American or respect for the lives that he was prepared to take," the statement said.
The defense argued that Mohamud was entrapped by the FBI.
"I thought the FBI took it too far and I think we are hopeful those mitigating factors will be considered at sentencing," said defense attorney Stephen Sady.
Osman Barre, Mohamed Mohamud's father, testified that he was concerned for his son's safety when he contacted the FBI in 2009.
Barre says Mohamud told him he was planning to fly to Yemen to learn Arabic, according to the Associated Press.
Barre says contemporary news accounts of Somali-American teenagers joining the mujahedeen in Somalia persuaded him to contact the FBI and say he feared his son was being brainwashed by al-Qaida recruiters.
But Barre said Monday he now thinks it was an elaborate FBI sting that "brainwashed" his son.
Mohamud did not take the witness stand.
Assistant U.S. Attorney Ethan Knight said Wednesday in closing arguments that Mohamud was predisposed to terrorism when he was 15 years old, the age he told undercover agents he began to think about committing violent jihad.
Knight said jurors may have disagreed with the FBI's methods in its undercover sting operation, the Associated Press reported, but they couldn't argue that Mohamud intended to kill thousands at Portland's 2010 Christmas tree-lighting.
"We tried to present all the evidence as fairly and as clearly as we possibly could," Knight said. "And in some sense, the jury clearly saw that and agreed with it within the law and found the defendant guilty."
Mohamud's parents attended much of the trial, but were not in the courtroom to hear the verdict. They could not be reached for comment.
"I think we all kind of expected that [verdict]. We didn't expect to get any justice," said Saba Ahmed, a member of the local Muslim community who knows Mohamud.
She added, "We wish the FBI had tried to stop him instead of encouraging that behavior. When I was at the trial, I saw how the FBI undercover agents showed him training videos produced by the U.S. government on training jihadi errorists. That sort of stuff, Beaverton teenagers don't think about that stuff."
The trial lasted 10 days.
The defense had filed a motion for a mistrial before the verdict was reached, saying a question by the jury was answered in a confusing manner by the court.
Mohamud's attorneys said the response given to jurors needed to be withdrawn and a new statement written up. If that wasn't done, the defense said the alternative was a motion for mistrial.
Judge Garr M. King issued an order denying the motion for a mistrial Thursday afternoon.
Thursday, December 12 2013 8:27 AM EST2013-12-12 13:27:21 GMT
Former Suns star and current broadcaster Tom Chambers has been arrested on suspicion of drunken driving, Scottsdale police records stated. Chambers, 53, was arrested Saturday at East Pinnacle Vista DriveMore >
The 53-year-old has apologized to the NBA team and its fans after being arrested in Scottsdale Saturday night on suspicion of DUI.More >
Wednesday, December 11 2013 11:05 AM EST2013-12-11 16:05:29 GMT
Claudia Ann Lucero, Alex Madrid
Mesa police have announced they've made an arrest in the death of a 14-year-old girl whose body was found in a trash container early Friday morning. Officers said they took the victims' mother's ex-boyfriendMore >
Alex Madrid, 31, of Mesa, a convicted felon and the boyfriend of the victim's mother, was taken into custody in connection with the death of 14-year-old Claudia Ann Lucero, who was strangled and sexually assaulted, police said.More >
Thursday, December 12 2013 1:02 AM EST2013-12-12 06:02:20 GMT
Kyle DeBerry (Source: Goodyear Police Department)
A former wrestling coach in the west Valley has been arrested on sex charges, Goodyear police said Wednesday. Kyle DeBerry, 25, was booked into the Fourth Avenue Jail on charges of luring a minor forMore >
Kyle DeBerry, 25, was booked into the Fourth Avenue Jail on charges of luring a minor for sexual exploitation and assault.More >
Thursday, December 12 2013 12:42 AM EST2013-12-12 05:42:07 GMT
A California family whose dog went missing during an Arizona camping trip a year and a half ago didn't think they'd ever see him again. But, fortunately, they were wrong. This is video of the emotionalMore >
A California family whose dog went missing during an Arizona camping trip a year and a half ago didn't think they'd ever see him again. But, fortunately, they were wrong.More >
Tuesday, December 10 2013 3:03 PM EST2013-12-10 20:03:34 GMT
A Ponchatoula, La. woman pleaded guilty Tuesday morning after being charged with child desertion. She was accused of putting her child in an ice chest, along with a gas can, and closing the lid. JamiMore >
A Ponchatoula, La. woman pleaded guilty Tuesday morning after being charged with child desertion. She was accused of putting her child in an ice chest, along with a gas can, and closing the lid.More >
Wednesday, December 11 2013 10:46 AM EST2013-12-11 15:46:14 GMT
Maricopa County Sheriff Joe Arpaio
Sheriff Joe Arpaio said Tuesday he will house about 150 military veteran inmates under one roof in a segregated section of the Towers Jail facility. The new military veterans housing unit will featureMore >
"They fight for us overseas, so, we must fight for them here," Sheriff Joe Arpaio said. "When their duty is done, ours has just begun."More >
Wednesday, December 11 2013 7:11 PM EST2013-12-12 00:11:25 GMT
At a time when many college students are clamoring for scholarships to help cover the rising cost of tuition, a 25-year-old Grand Canyon University student has turned one down. "I'm not going to allowMore >
A Grand Canyon University student has turned down a $10,000 scholarship to live on campus in favor of living at an apartment complex with the people he serves.More >