As Wal-Mart reported higher-than-expected first-quarter earnings on Thursday, it suggested in a regulatory filing that the scope of an internal investigation into bribery accusations had widened beyond the retailer’s subsidiary in Mexico.

The company reported that the audit committee of the Wal-Mart Stores board was examining possible violations of the Foreign Corrupt Practices Act and “other alleged crimes or misconduct in connection with foreign subsidiaries, including Wal-Mart de México.” It was the first public disclosure by the company that the internal inquiry could involve additional subsidiaries, though none was named.

The regulatory filing also confirmed that Wal-Mart is the subject of investigations by the Securities and Exchange Commission and the Justice Department. And while Wal-Mart said in December that it did not expect the bribery accusations and their fallout to hurt the company, it backed away from that assertion on Thursday.

“Although the company does not presently believe that these matters will have a material adverse effect on its business, given the inherent uncertainties in such situations, the company can provide no assurance that these matters will not be material to its business in the future,” the filing said.