UNITED NATIONS, Shawwal 14, 1434, Aug 21, 2013, SPA - Britain and France will send a letter to U.N. Secretary-General Ban Ki-moon later on Wednesday to officially request a U.N. investigation into an alleged gas attack in Syria, a U.N. diplomat said on condition of anonymity, Reuters reported. Western and regional countries have publicly called for U.N. chemical weapons investigators, who arrived in Damascus three days ago to look into previous allegations of such attacks, to be dispatched to the scene of what may be one of the deadliest incidents of Syria's two-year-old civil war. -- SPA 19:11 LOCAL TIME 16:11 GMT www.spa.gov.sa/1138946