Officials have ordered the evacuation of 300 homes downwind of a fire at a former steel mill site outside Buffalo, citing air quality concerns.

Fire crews remain at the smoky scene in Lackawanna on Thursday, 24 hours after the fire started inside a massive building housing several businesses on the former Bethlehem Steel site.

Officials say the blaze is contained but may continue to burn for days in hard-to-reach areas.

Democratic Gov. Andrew Cuomo visited the site Thursday. Local schools were closed due to smoky conditions.

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Families were asked to stay with friends or relatives, or go to shelters at a senior center and the high school.

More than 100 firefighters from Lackawanna, Buffalo and other communities struggled throughout Wednesday to extinguish the blaze. No injuries have been reported.