Witnesses told authorities that the suspect used a "makeshift flamethrower and threw an incendiary device into the crowd, " said Mark Michalek, who heads the FBI's Denver office. He identified the suspect as Mohamed Sabry Soliman, 45. Redfearn added those devices included Molotov cocktails being tossed at the crowd.

Colorado Gov. Jared Polis and community leaders gathered for a vigil Wednesday for the victims of a violent attack​ against a group marching to bring awareness to Israelis held captive in Gaza.