A teenager suspected in a shooting attack at a suburban Denver high school that left two students in critical condition appeared fascinated with previous mass shootings including Columbine and expressed neo-Nazi views online, according to experts.

The Anti-Defamation League says the number of antisemitic incidents in the United States reached a record high last year.

FILE - In this Wednesday, Jan. 6, 2021 file photo, supporters of President Donald Trump gather outside the U.S. Capitol in Washington. Two white nationalists known for racist and anti-Semitic rhetoric livestreamed to their online followers after breaking into the Capitol during the deadly insurrection. The presence of anti-Semitic symbols and sentiment at the Capitol riot raised alarms among Jewish Americans and experts who track discrimination and see it as part of an ongoing, disturbing trend. “That is the real danger of the anti-Semitism in this moment.” QAnon believers also allege a false conspiracy to harm children, paralleling another anti-Semitic trope, he noted. Looking ahead, Harris of AJC urged Jewish leaders to do their part in combatting the rise of QAnon.