Landon Mitchell said he'd evade detection because he was "masked up" on January 6, a complaint said.
He told friends he was "invincible," the complaint said.
He was arrested on Wednesday after a friend identified him, the complaint said.
A Capitol riot suspect who'd said he wasn't worried about being caught because he was "masked up" on January 6 was arrested on Wednesday after a friend identified him, court documents said.
A criminal affidavit filed in the US District Court of the District of Columbia this week said Mitchell had been identified by Luke Wessley Bender, a former colleague who has also been charged with breaching the Capitol.
Bender was arrested in July after a high-school classmate tipped off authorities. Bender then identified Mitchell as the person he had attended the rally with and who appeared in photos he'd posted on social media, the complaint said.
An FBI investigation found Facebook messages Mitchell had sent to friends describing his role in the insurrection.
Mitchell told friends that he had "breached the Capitol" and had been "one of the very first in," the complaint said.
He also said he was not worried about being arrested and described himself as "invincible," the complaint said.
"Seriously tho I'm not too worried," he told a friend who asked later in January if he had been arrested, the complaint said. "I was masked up the whole time," he added, per the complaint.
In another conversation, Mitchell told a friend that he had identified the back of his head in footage posted by The New Yorker, saying, "Thank God for giving me the foresight to keep my mask up," the complaint said.
Federal prosecutors have charged more than 600 people with offenses related to the January 6 riot.
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