VIDEO: An extra-alarm fire involving multiple homes in Chicago's Humboldt Park neighborhood Sunday night has left one firefighter suffering from minor injuries. The fire started just after 11:30 p.m. inside of a vacant 2 1/2-story home in the 800-block of North Lawndale Avenue, the Chicago Fire Department said. The vacant home was destroyed and two other homes damaged in the 2-alarm fire. The vacant home collapsed during the fire. One firefighter was taken to a hospital with a minor injury. At least four people are trying to figure out where to go next as their homes are boarded up. The cause of the fire is under investigation, but a neighbor told ABC7 he saw two men in the backyard overnight lighting a bonfire.