The FBI is investigating a terrorist attack in Boulder, Colorado, after a man attacked a group of people who were participating in a walk to remember the Israeli hostages still in Gaza.

Mohamed Sabry Soliman, 45, was arrested on Sunday after allegedly attacking members of the Run for Their Lives group outside Pearl Street Mall in Boulder. The FBI revealed that the suspect, while yelling “Free Palestine,” set walk participants on fire using “a makeshift flamethrower” and also threw an incendiary device into the crowd.

At least eight people were injured in the attack, their ages ranging from 52 to 88. Two were airlifted to a hospital. Boulder Police Chief Stephen Redfearn added that one of the victims was “very seriously injured.”

The eldest victim, Rabbi Israel Wilhelm, was a Holocaust survivor, organizers told CBS.

FBI Director Kash Patel said earlier on Sunday that the FBI was investigating a “targeted terror attack” outside Pearl Street Mall, where Run for Their Lives was holding a “peaceful walk to show solidarity with the hostages and their families, and a plea for their release.”

At 1:30 p.m., Colorado police responded to the attack, which FBI Deputy Director Dan Bongino said was being investigated as “an act of ideologically motivated violence.”

Gov. Jared Polis (D-CO) condemned the attack on Sunday afternoon in a post on X.

“I am closely monitoring the situation in Boulder, and my thoughts go out to the people who have been injured and impacted by this heinous act of terror. Hate-filled acts of any kind are unacceptable. While details emerge, the state works with local and federal law enforcement to support this investigation. More information will be provided as it becomes available,” Polis said.

A White House official confirmed to CNN that President Donald Trump has been briefed on the attack.

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Run for Their Lives was started by a group of Israelis in California, according to its website. It hosts a short walk or run every week in neighborhoods across the country to raise awareness of the Israeli hostages Hamas took on Oct. 7, 2023.

Its website describes the walks as “meant to be quiet and peaceful,” as well as “family-friendly” and “non-violent.”