TROUTDALE, Ore. During the chaos at Reynolds High on Tuesday, police arrested a man who they said brought a gun to the school.

Officers found a handgun on 21-year-old Joseff Powell while searching groups of people leaving the school grounds during the building evacuation, according to an affidavit filed by a Multnomah County prosecutor.

Read: Affidavit on Joseff Powell arrest

The school was being evacuated because a gunman had opened fire on campus, killing one student and wounding a teacher. Powell's arrest came in the aftermath that followed.

Powell told detectives he heard about the shooting and brought the gun to the school so he could protect his sister, Deputy District Attorney Adam Gibbs wrote in the affidavit.

He acknowledged that bringing the gun with him was stupid and that he does not have a permit to carry a concealed firearm, Gibbs wrote.

Powell's sister is a freshman student at Reynolds High School.

A police sergeant said he noticed Powell because he was trying to avoid a search checkpoint as people filed out of the school building, the affidavit said.

The sergeant said Powell looked unusually nervous.

Police seized a 9mm Taurus semi-automatic handgun, which they said Powell had hidden in his waistband. The gun was loaded but did not have a round in the chamber.

Powell now faces with one count of unlawful possession of a firearm.

Detectives said they did not find any link between Powell and the accused school shooter, Jared Padgett.

Background: Suspect in school shooting identified as Jared Padgett

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