CHICAGO --Crews are trying to fix a roof that caved in Friday morning on Chicago's West Side.It happened around 10 a.m. in the 1600-block of North Central Park. That's in the city's Humboldt Park neighborhood. The fire department says workers were trying to remove a chimney from a house. The roof caved in because of an apparent lack of structural support. It caused major damage to the house. No one was hurt.