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Get your refund if you overpaid for TP.

NEW YORK/WASHINGTON (Reuters) - Amazon.com Inc has started asking customers to cooperate with a Department of Justice criminal investigation of third-party sellers on its e-commerce marketplace, according to an email seen by Reuters.

The company is informing customers, who may have purchased products from such sellers, according to the email sent by Joell Parks, a senior law enforcement response specialist at Amazon.

On Wednesday, four lawmakers, including House Judiciary Committee Chairman Jerrold Nadler and David Cicilline, antitrust subcommittee chairman, sent a letter to the Justice Department asking the agency to investigate the matter.

Earlier this month, the company said it is working with state attorneys general to identify and prosecute such third-party sellers and has restricted the type of merchants who can sell health and sanitation items on its website.