Fifteen people and a dog were injured after a man with a “makeshift flamethrower” threw an incendiary device into a crowd of protestors in a mall in Boulder, Colo., who were calling for the release of Israeli hostages in Gaza.

Sunday afternoon's attack in Boulder, Colorado, took place hours before the start of a major Jewish festival, Shavuot. Authorities say a man used a flamethrower and threw an incendiary device into a group holding one of its regular rallies in solidarity with Israeli hostages in Gaza.

Officials said a man in Boulder injured eight people with incendiary devices and a makeshift flamethrower as they raised awareness for hostages held by Hamas.