London, Oct 16 (SPA) -- Secretary of State Condoleezza Rice said on Sunday that Iraqis had probably approved a U.S.-backed draft constitution in a historic referendum that she predicted would reduce insurgent violence. "Most people assume on the ground that it probably has passed," Rice told reporters during a visit to London. The top U.S. diplomat hailed the turnout, particularly in Sunni Arab areas, where she said voter numbers had roughly doubled compared with parliamentary elections in January. Basing her figures on reports from U.S. officials in Iraq, Rice said the overall turnout was about 63-64 percent, which was also higher than in January, Reuters reported. --SPA 1347 Local Time 1047 GMT www.spa.gov.sa/296635