(CNN) — A man yelling “Free Palestine!” used incendiary devices and a makeshift flamethrower to attack people calling for the release of Israeli hostages Sunday in Colorado, in what authorities are calling a targeted antisemitic attack.

Witnesses described seeing huge flames and people pouring buckets of water onto burning victims. At least 12 people were injured, including four women and four men between the ages of 52 and 88, authorities said. Two victims were airlifted to the Denver metro area. At least one victim was “very seriously injured,” officials said.

No victims have died, the Boulder Police Department said Monday morning.

The FBI is investigating the attack as “an act of terrorism,” the agency said. It happened at a weekly walk in support of the Israeli hostages held by Hama

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