(LEAD) U.S. lawmakers urge Abe to offer sincere apology for sexual slavery
(ATTN: UPDATES in paras 1-5, 8 with victims suing Japan for damages, photo, edits to conform) By Chang Jae-soon WASHINGTON, July 28 (Yonhap) -- U.S. lawmakers urged Japanese Prime Minister Shinzo Abe on Tuesday to offer a sincere apology for the coun