Islamic State killed up to 770 after seizing Tikrit in June-HRW
Killing of hundreds of Iraqi army soldiers after Islamic State's capture of Tikrit adds to group's notoriety
A member of the "Al-Habib al-Mustafa" Brigades rides a horse during graduation ceremony for rebel fighters at a camp in eastern al-Ghouta
A member of the "Al-Habib al-Mustafa" Brigades rides a horse as he carries an Islamist flag during a military display as part of a graduation ceremony for rebel fighters at a camp in eastern al-Ghouta, near Damascus September 4, 2014. Newly graduated rebel fighters, who went through military training, will join the brigades. REUTERS/Bassam Khabieh (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Rebel fighters demonstrate their skills during a military display as part of a graduation ceremony at a camp in eastern al-Ghouta
Rebel fighters demonstrate their skills during a military display as part of a graduation ceremony at a camp in eastern al-Ghouta, near Damascus September 4, 2014. The newly graduated rebel fighters, who went through military training, will join the "Al-Habib al-Mustafa" Brigades. REUTERS/Bassam Khabieh (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Rebel fighters demonstrate their skills during a military display as part of a graduation ceremony at a camp in eastern al-Ghouta
Rebel fighters demonstrate their skills during a military display as part of a graduation ceremony at a camp in eastern al-Ghouta, near Damascus September 4, 2014. The newly graduated rebel fighters, who went through military training, will join the "Al-Habib al-Mustafa" Brigades. REUTERS/Bassam Khabieh (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Rebel fighters demonstrate their skill with their weapons during a military display as part of a graduation ceremony at a camp in eastern al-Ghouta
Rebel fighters demonstrate their skill with their weapons during a military display as part of a graduation ceremony at a camp in eastern al-Ghouta, near Damascus September 4, 2014. The newly graduated rebel fighters, who went through military training, will join the "Al-Habib al-Mustafa" Brigades. REUTERS/Bassam Khabieh (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
A rebel fighter demonstrates his skill with a melee weapon during a military display as part of a graduation ceremony at a camp in eastern al-Ghouta
A rebel fighter demonstrates his skill with a melee weapon during a military display as part of a graduation ceremony at a camp in eastern al-Ghouta, near Damascus September 4, 2014. The newly graduated rebel fighters, who went through military training, will join the "Al-Habib al-Mustafa" Brigades. REUTERS/Bassam Khabieh (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
A rebel fighter aims his weapon during a military display as part of a graduation ceremony at a camp in eastern al-Ghouta
A rebel fighter aims his weapon during a military display as part of a graduation ceremony at a camp in eastern al-Ghouta, near Damascus, September 4, 2014. The newly graduated rebel fighters, who went through military training, will join the "Al-Habib al-Mustafa" Brigades. REUTERS/Bassam Khabieh (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT TPX IMAGES OF THE DAY)
Rebel fighters demonstrate their skill with their weapons during a military display as part of a graduation ceremony at a camp in eastern al-Ghouta
Rebel fighters demonstrate their skill with their weapons during a military display as part of a graduation ceremony at a camp in eastern al-Ghouta, near Damascus September 4, 2014. The newly graduated rebel fighters, who went through military training, will join the "Al-Habib al-Mustafa" Brigades. REUTERS/Bassam Khabieh (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Should Israel open the occupied Golan Heights to Syrian refugees?
Israel is the only country sharing a border with Syria that has not taken in refugees
A general view shows a deserted street filled with debris in Aleppo's al-Mashhad district
A general view shows a deserted street filled with debris in Aleppo's al-Mashhad district September 3, 2014. Picture taken on September 3, 2014. REUTERS/Ammar Abdullah (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)