LACKAWANNA, N.Y.-- Firefighters are responding to major fire at the former Bethlehem Steel site.

The fire was reported around 7:30 a.m. Wednesday at the property off of Route 5 in Lackawanna.

Our crews at the scene say they heard several explosions coming from the building.

Route 5 closed between Lake Ave. and Ridge Rd.

Authorities say shelter in place from Lackawanna to Athol Springs includes residents in Hamburg and Lake Shore.

Hamburg Central Schools has issued a 'shelter in place' due to the fire. They released this statement on their website:

The Hamburg Central School District is aware of this morning’s fire at a Lackawanna site. Authorities are monitoring air quality in the area and providing guidance to school officials. At this time, there is no air quality risk posed to those in the district. As a precaution, a shelter in place is now in effect in all our schools. This suspends all outdoor activity, however indoor teaching activities will continue as usual. We will update you if this situation changes.

Erie County Legislator Lynn Dixon says the building belongs to a mulching company. She says this is the third fire there in the last few weeks.