American Express ( AXP) is being probed by the Justice Department for certain fees charges to merchants, according to a regulatory filing Friday.

AmEx said it would cooperate with the department's request for information related to "merchant surcharging and its 'anti-steering' policies that prohibit merchants from discriminating against the card in favor of other forms of payment," according to the quarterly filing with the Securities and Exchange Commission.

American Express on Thursday said it would lay off 10% of its workforce and take other cost-saving measures, after posting a big loss last week. Visa ( V) also posted a big third-quarter loss on Wednesday.

This article was written by a staff member of TheStreet.com.

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