Costco Warehouse Corp said on Thursday that it will continue to procure eggs from Hillandale Farms, which an animal welfare group this week said was mistreating hens at one of its facilities in Gettysburg, Pennsylvania.

The Humane Society of the United States released footage by a former Hillandale employee showing hens laying eggs in cramped cages with deceased birds. The footage, gathered in April and May, also showed broken eggs and dead chickens on the floor.

The conditions in the video appeared to violate Costco's published "Mission Statement on Animal Welfare." The retailer said it believes it to be an isolated incident.

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