BAGHDAD (AFP) - The rushed drafting of Iraq's new constitution has deepened sectarian rifts and is likely to fuel the Sunni-led insurgency and hasten the country's violent break up, a leading think-tank said. "Instead of healing the growing divisions between Iraq's three principal communities -- Shiites, Kurds and Sunni Arabs -- a rushed constitutional process has deepened rifts and hardened feelings," the International Crisis Group (ICG) said in a report. Iraq "appears to be heading toward de facto partition and full-scale civil war" said the report, unless Washington makes "a determined effort to broker a true compromise between Shiites, Kurds...