Wal-Mart faces US investigation

● US politicians said yesterday they were launching an investigation into allegations of bribery at Wal-Mart’s Mexican affiliate. Two Democratic lawmakers sent a letter to Wal-Mart chief executive Mike Duke to request a face-to-face meeting with company officials over claims the company halted an internal probe into bribery in Mexico. Wal-Mart shares fell 4.7 per cent yesterday.