Police in Colorado are responding to a "heinous" attack at a pedestrian mall in the city that they say left several victims.

A man suspected of using a “makeshift flamethrower” to carry out a terror attack on pro-Israel demonstrators in Colorado was initially mistaken for a gardener by witnesses.Mohamed Sabry Soliman, 45, was carrying a garden sprayer filled with gasoline and had reportedly been lurking in the area for at least 20 minutes before the horrific alleged assault in Boulder on Sunday.

Authorities say a man posed as a gardener before launching an attack in Boulder with Molotov cocktails that injured 12 people.