A Buffalo, N.Y., Tyson meat processing plant has been shut down by the U.S. Department of Agriculture (USDA) after inspectors found violations during follow-up testing.

The USDA's Food Safety and Inspection Service was conducting an inspection connected to a recent recall of deli meat produced by the facility. In August, 380,000 pounds of deli meat sold at Wal-Mart were voluntarily recalled after roast beef samples tested positive for Listeria monocytogenes.

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"We're working diligently to address this matter, since food safety and quality are essential to the continued success of our deli meat business," said Gary Mickelson, a Tyson spokesman. The plant employs 560 workers, roughly 480 of whom are affected by the "temporary suspension of operations," according to Mickelson.