BOSTON (WHDH) - Firefighters investigating an “unknown haze” that turned out to be a refrigerator fire at a Boston medical center, officials said Tuesday.

Firefighters responded to a Level 2 Hazmat alert at Tufts Medical Center around 4 p.m. Tuesday are were investigating an “unknown haze” on the 7th floor, according to a tweet from the Boston Fire Department. No illnesses were reported but the building was evacuated as a precaution, officials said.

Officials said a fire in a walk-in refrigerators was sealed off and they determined the air quality of the building to be safe.

This is a developing news story; stay with 7NEWS on-air and online for the latest details.

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