(Jose M. Osorio/Chicago Tribune)
People stand on the sidewalk outside of the building at 77 West Wacker Drive in Chicago as a hazmat EMS Plan 1 is called for a chlorine leak on Friday, Oct. 13, 2017. (Jose M. Osorio/Chicago Tribune) 
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At least six people were taken to hospitals because of a chemical smell at a building in the Loop, authorities said.
Firefighters were called to the building at 77 W. Wacker Drive around 10:30 a.m. after chemicals mixed for cleaning purposes gave off sickening fumes, officials said.
Six people were transported from the scene in fair to serious condition, fire officials said. At least two of them were taken to Northwestern Memorial Hospital.
One person at the scene refused medical treatment.
Check back for updates.
