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NEW KENSINGTON (KDKA) — Firefighters returned to the scene Friday of a large fire that burned half a block in New Kensington just one day earlier.

They were called back Friday morning to put out hot spots that continue to smolder.

(Photo Credit: KDKA Photojournalist Dave Colabine)

The state fire marshal now knows the fire started in a vacant building, but how the fire started remains unknown.

At least 60 firefighters were called to fight the blaze that involved four buildings on 9th Street.

The roofs in two of the buildings collapsed. Those buildings will be torn down.

(Photo Credit: KDKA)

The fire damaged several apartments and four businesses.

“It’s still crushing me,” said Byron Green, whose business was destroyed. “Now I don’t have nothing to lean on, to come to and open up in the mornings.”

Green hopes he’ll be back in business in the future.

The investigation continues into the blaze.