(REUTERS) — Wal-Mart Stores Inc lost $10 billion of its market value on Monday on concerns that a bribery investigation in Mexico could be very costly and hinder its plans to grow.

In a sign that the problem was widening for the world’s largest retailer, two U.S. lawmakers said they were launching their own investigation into allegations in a New York Times article that Wal-Mart de Mexico had engaged in a multi-year campaign of bribery to build its business. In Mexico, the front-running presidential candidate, Enrique Pena Nieto, and lawmakers also called on local authorities to investigate.

If the allegations are true, Wal-Mart may have violated the U.S. Foreign Corrupt Practices Act (FCPA), which forbids bribes to foreign government officials, as well as run afoul of Sarbanes-Oxley rules that require corporate gatekeepers to report material violations of securities laws.

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