The head of the Al Nusrah Front called for a ceasefire between the Islamic State of Iraq and the Sham and clashing rebel groups in Syria, the creation of an independent Islamic council to mediate disputes, and the exchange of prisoners. An opposition activist group said that 274 people have been killed in four days' fighting between ISIS and rebel groups, including at least 99 ISIS fighters, of whom 34 were executed by rebels. The activist group also claimed that regime airstrikes in Aleppo have killed over 600 people in the last three weeks. Over 100 ISIS fighters are said to be besieged by rebels in Aleppo and to have asked Al Nusrah to mediate. In Deir Izzour, ISIS fighters withdrew from their base in al-Mayadeen and headed toward Raqqah city. ISIS clashed with Al Nusrah and rebels, including the Kurdish Front Battalion, in Raqqah province. ISIS fighters, backed by Al Nusrah and rebels, captured two towns and several villages in Hasakah from Kurdish YPG fighters, who retreated. At least 34 non-Syrian fighters from ISIS and Jund al-Aqsa were executed by rebels in Idlib; ISIS killed tens of rebels in a suicide bombing near Derkosh yesterday. The first shipment of Syria's chemical weapons left the country from Latakia.