Witnesses to Sunday afternoon's terror attack in Colorado who were involved in a march through Boulder say they worked as a team to try and put out the flames that were actively burning their fellow marchers. At least 12 people were injured, many by severe burns, after an attacker set several people on fire using a makeshift flamethrower and Molotov cocktails.

A police officer responds to the scene of the terror attack in Boulder, Colorado, on Sunday afternoon. Brian Horwitz

Those with the organization known as Run for Their Lives have been marching through downtown Boulder for more than a year, hoping to raise awareness of the dozens of Israeli hostages being held by Hamas in Gaza.

Each week the group marches through Pearl Street Mall and ends their gathering at the historic

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