The collapse happened at Hillandale Farms in the 300 block of Spicer Road, Tyrone Township just before 7:30 a.m., according to emergency dispatchers.
The chicken house on the property was scheduled to be demolished when it collapsed suddenly, police say.
Eight people were inside at the time of the collapse, according to an updated release by Pennsylvania state police.
Seven people have been taken to area hospitals but one person was found dead by rescue workers.
Officials remain on the scene as of 12:30 p.m. on Friday.
The public and the press are asked to avoid the area by state police.
Pennsylvania state police are investigating this deadly collapse.
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