US retail giant Wal-Mart has fired three executives and four managers for breaching company rules.

A Wal-Mart spokeswoman declined to reveal the names of the seven employees, who all worked at the company's Bentonville, Arkansas headquarters.

Spokeswoman Sharon Weber added that the firings were not related to a "criminal investigation, or financial impropriety or sales performance", reported Reuters. Weber said the company does anticipate any other firings related to this.