A small fire on the plant’s roof was initially contained but reignited Sunday afternoon, authorities said. More than 90,000 residents east of Atlanta were told to keep sheltering in place Monday a day after a chemical plant fire sent a massive plume of dark smoke high into the sky that could been seen for miles.

A shelter-in-place advisory is extended in Rockdale County, Georgia, after a fire and chemical release erupted at a BioLab plant east of Atlanta. Thousands of residents in the city of Conyers were evacuated and the presence of chlorine has been confirmed by the EPA.