A massive chemical fire at a BioLab plant in Conyers, Georgia, ignited chaos across the region, sending over 90,000 residents into emergency shelters and spreading a thick haze of dangerous smoke and chemical odor as far as Atlanta.

For everyone sheltering in place, the best practice is to turn the air conditioning off and keep windows and doors shut,” a statement said.

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.