Mega-retailer Wal-Mart is drawing fire for publishing an ad on its website Monday that included a racial slur.

The retailer based in Bentonville, Ark., featured an ad on its website early Monday offering a wig cap for sale in which the color was described as n—r brown. The ad has since been removed and Wal-Mart told the Huffington Post that it has determined that the product was sold by a third-party seller posing as a company out of the United Kingdom.

Wal-Mart said Monday night it was working on suspending the account of the third-party seller.

Wal-Mart apologized for the ad in a statement via social media.

“We are very sorry and appalled that this third party seller listed their item with this description on our online marketplace,” Wal-Mart said via Twitter. “It is a clear violation of our…