UPDATE: Contractors working on the building.
Sources are reporting an abandoned structure fire with someone possibly trapped on the roof.
It happened just before 7:30 pm tonight near Kishwaukee and 23rd ave.
Reports of the building on fire with unconfirmed reports are saying a person is trapped on the roof.
A person said they saw flames coming from the building and a person on the rooftop.
Used to be a factory, and is 5 stories tall.