By CBS 2 Chicago Staff

CHICAGO (CBS)– Crews responded to a hazmat situation in the West Loop early Tuesday morning.

Carbon monoxide levels were found in the parking garage  at an apartment building in the 1000 block of West Madison Street just after 3 a.m.

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Chicago firefighters opened doors and used industrial fans to get the carbon monoxide out of the building.

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No one was hurt and the building was not evacuated.

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A broken ventilation fan was the cause of the high levels.

CBS 2 Chicago Staff