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 Boulder Jewish Community Center is offering resources to the Colorado community after Sunday's attack, where 15 people were injured at a rally calling for the release of Israeli hostages in Gaza.

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