Two Chicago police officers were injured Sunday evening after a man attending a festival set himself and a building on fire in the city's Heart of Chicago neighborhood.

About 7:30 p.m., a man at a festival near 18th Street and Ashland Avenue set himself and a building on fire, said Officer Michelle Tannehill, according to preliminary reports.

Leticia Sandoval, 34, who was working at a drink stand at the Mole de Mayo festival, told the Chicago Tribune her daughter called her saying there was a man in his underwear and an American flag carting a can of gasoline. She said he threw a rock into the Metro PCS store, set the store on fire and ran away.