Mohamed Sabry Soliman, 45, was arrested at the scene, after he allegedly set his victims on fire as they peacefully rallied on behalf of Israeli hostages still being held by Hamas in Gaza. Soliman was heard yelling "Free Palestine" and other anti-Israel slogans during the attack on victims ranging in age from 52 to 88.

The FBI says the suspect in the attack in Boulder used a makeshift flamethrower and federal law enforcement is investigating the attack as an act of terrorism.

Boulder Police Chief Stephen Redfearn had reason to believe a Sunday afternoon attack on the Pearl Street Mall was terror. At 1:26 p.m., a man had thrown Molotov cocktails at a group walking to raise awareness of Israeli hostages being held by the terrorist group Hamas.

Mohamed Sabry Soliman, who allegedly attacked a pro-Israel rally in Colorado on Sunday, could be another lone wolf, leading to concern among experts about the rise of such attacks.

Mohamed Sabry Soliman, 45, intended to carry out a mass shooting in downtown Boulder and only switched to an explosive plan after he was denied a gun because of his immigration status, county

Police say Mohamed Sabry Soliman arrived in Boulder on Sunday with 18 Molotov cocktails but threw just two while yelling “Free Palestine."

Mohamed Sabry Soliman, 45, of El Paso County, Colorado, threw molotov ... by a Jewish group in downtown Boulder, Michalek said, adding that the FBI was investigating it as an act of terrorism.

Police in Boulder, Colorado, are responding to an attack at the Pearl Street Mall that they say left several victims.