Customers at a Walmart store in southern New Jersey are expressing dismay after hearing that someone used the public address system to order “all black people” to leave.

As she left the store Wednesday, customer Sharon Osbourne of Williamstown said she considers Sunday’s announcement “appalling, stupid and sad.”

A male voice came over the public-address system that evening at a store in Washington Township and calmly announced: “Attention Walmart customers: All black people leave the store now.”

Management apologized. Officials with Wal-Mart Stores Inc. say that it was “unacceptable” and that they’re trying to determine who made the announcement and how it happened.