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.

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.

Mohamed Sabry Soliman, an Egyptian national, allegedly planned the arson attack, which injured 12, for more than a year

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.

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.

Ed Victor had just finished the Run for Their Lives walk and was with group members gathering outside the Boulder, Colorado, courthouse on Sunday afternoon when he said he heard a crash, felt heat -- and then saw a woman on fire.

The FBI conducted an early-morning raid on the Colorado Springs home of illegal immigrant Mohamed Soliman, accused of firebombing a pro-Israel rally.

A bipartisan group of Jewish state lawmakers called Monday for “our allies to speak out” against the antisemitic violence on display in the fire attack on Boulder’s Pearl Street