A school in Munhall, Pennsylvania closed down on Wednesday due to concerns for safety after asbestos was discovered on the roof. After parents complained at a school board meeting Tuesday night, the district decided to close the building.

Students were sent home with a note earlier that day informing parents that asbestos had been found on the roof of the building during renovation. The school district said that work on the roof stopped immediately when the asbestos, a carcinogen known to cause mesothelioma and lung cancer, was found.

Munhall is a small community located in southwestern Pennsylvania that sits along the west bank of the Monongahela river. Follow local news coverage here.