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CHICAGO — Two Chicago firefighters were treated for heat exhaustion after battling a fire in a high-rise commercial building that houses several jewelry stores in the city’s Loop, officials said.

The fire broke out just after 4 a.m. Thursday at Jewelers Center at The Mallers Building, located at 5 S. Wabash. The fire was reported on the 10th floor of the 22-story building.

The blaze drew a massive emergency response of at least 200 firefighters.

Two firefighters who were overcome by heat were taken to Northwestern Memorial Hospital for treatment, but no other injuries were reported.

The fire was extinguished in about 90 minutes.

The fire commissioner says there have been several fires in the building over the years.

The cause of the fire is under investigation.

The fire was struck around 5:45 a.m. Street closures are still in place at Madison and Wabash. CTA is rerouting multiple buses due to the closures.

This is a developing story. Check back for details.

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