Taiwanese prosecutors are probing whether President Chen Shui-bian's wife, Wu Shu-chen, received at least NT$5 million ($1.19 million) in gift coupons from an upmarket department store, amid allegations that her friends may have lied about buying the vouchers. Quoting judicial sources, Taiwanese television news reports said yesterday that after interviewing a friend of Ms Wu, identified as Lee Pi-chun, prosecutors had found a discrepancy in a statement about the gift vouchers. Ms Wu was alleged by opposition legislators to have accepted the gift vouchers between April and September 2004 in return for using her influence to help a business tycoon fight for ownership of the Pacific Sogo Department Store. Opposition Kuomintang legislator Chiu Yi later claimed Ms Wu had actually sold the vouchers to seven friends at a discount. All of Ms Wu's friends denied the accusations, saying they did not get the vouchers from the president's wife but bought them from Ms Lee. Ms Wu has denied she was given the vouchers as a reward.