BEIRUT (Reuters) - A convoy is set to leave the Islamic State-held enclave of Syria s Raqqa city on Saturday under an arrangement brokered by local officials, the U.S-led coalition against Islamic State in Iraq and Syria said on Saturday.   The arrangement is designed to minimize civilian casualties and purportedly excludes foreign (Islamic State) terrorists,  the Combined Joint Task Force - Operation Inherent Resolve said in an emailed statement.  The statement said the coalition does not condone  any arrangement that allows (Islamic State) terrorists to escape Raqqa without facing justice . 