Portland police picked the boys up and said they found a cocked and loaded .22 handgun which the youths reportedly used to carjack and rob 22-year-old Amy Garrett, news reports said.
Garrett told ABC News affiliate KATU she was waiting for her parents at the Freedom Foursquare Church in Portland when she was approached by the boys.
According to KATU, they boys told her to give them her truck or be shot.
"He was showing me his gun and I asked him if it was real," she said. "He said, 'You don't ever ask somebody if it's real. That's how you get yourself shot.'"
"I didn't think it was real," Garrett told the news outlet. "They were just two really young kids."
Garrett then told the station that the 7-year-old boy told his friend to "show her your piece," at which point the 11-year-old raised his shirt to show off the gun.
“He said it was fully-loaded and cocked and ready to go. He told me he was going to blow my brains out if I didn't give him anything," Garrett told KATU.
The victim refused to get out of her car but gave up her wallet and phone. She then drove away and called police.
"My heart was beating a million miles a minute. I'm surprised it didn't completely beat out of my chest. I was very scared," Garrett said.
A similar report indicates that Portland police received a call from another 11-year-old boy saying that he had seen a child with a gun. When officers arrived on the scene, the boys tried to flee but were caught.
According to a statement released by Portland police, the 11-year-old reached for his back pocket, but was grabbed by cops who found a cocked and loaded gun in his pocket.
While the children were not handcuffed or arrested because of their age, they were taken home to their parents' custody.
Police will report the incident to juvenile court, the statement said.
Detectives are still investigating where the 11-year-old obtained the weapon, reports said.