Militants from the Islamic State Organisation have in the past two weeks executed 700 members of a tribe in eastern Syria, the majority of them civilians, a human rights monitoring group said on Saturday. The Syrian Observatory for Human Rights, which has tracked violence on all sides of the three-year-old conflict, said that reliable sources reported beheadings were used to execute many of the al-Sheitaat tribe, which is from Deir al-Zor province. The conflict between the group of fighters calling itself Islamic State (formerly known as Islamic State of Iraq and Greater Syria, or ISIS) and the al-Sheitaat tribe, who...