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Congressmen Elijah E. Cummings and Henry A. Waxman, who are investigating bribery charges at Wal-Mart, on Thursday released documents that they obtained from a confidential source that indicates Mike Duke and other senior Wal-Mart officials were informed about bribery allegations multiple times. They said they sent a letter to Duke to discuss the documents.

Allegations surfaced last April that Wal-Mart failed to notify law enforcement that company officials authorized millions of dollars in bribes in Mexico to speed up getting building permits and gain other favors. Wal-Mart has been working with government officials in the U.S. and Mexico on that investigation.