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A historic warehouse building on South Wyoming Street collapsed early Saturday morning. The cause for the collapse is not yet known.

The warehouse was built in 1920 and once housed a refrigeration company. Much of its south-facing wall collapsed shortly after 8:30 a.m. The building was unoccupied and no injuries were reported. The collapse was witnessed by employees at Steele’s Furniture, which is just across the street from the warehouse.

Barricades have been erected around the structure.

David Schultz, Butte-Silver Bow’s public works director, said about a third of the south side of the building fell down, scattering bricks across Iron Street.

“It looks unlikely that any more substantial pieces of that building will collapse,” Schultz said. “But we can’t know that for certain. We have barricaded off the street to keep people away from the building in case there are additional problems.”

Schultz said he inspected the building Saturday morning and thought that perhaps plugged roof drains that allowed water to build up on the roof caused the building to collapse, but the building’s owner, Neil Lynch, disputes that.