The attack in Boulder Sunday comes as the number of antisemitic incidents nationwide tracked by the Anti-Defamation League reached a record high last year.

Hundreds of people came to stand together following an attack in Boulder over the weekend. Speakers included political and faith-based leaders.

The suspect, Mohammed Sabry Soliman, accused of throwing incendiary devices at them, allegedly planned the attack for a year, and told police he wanted to "kill all Zionist people," according to court documents.

The FBI and Department of Homeland Security issued a joint warning about increased threats to Israeli and Jewish communities in the U.S.