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Syrian Civil War

US-backed rebels, rival insurgents clash in Syria, 20 killed

Fighting between U.S.-backed Syrian rebels and rival militants has killed more than 20 people in northern Syria over the past two days, opposition activists said on Monday.

The fighting between the so-called Democratic Forces of Syria, which is led by Kurds, and Islamic militants has flared in recent days in the northern province of Aleppo. Most of the fighting has taken place in the border area, where Turkey is examining the possibility of creating a safe zone to protect civilians and moderate rebels fighting Syrian President Bashar Assad's forces.

The Britain-based Syrian Observatory for Human Rights said the fighting is concentrated near the town of Azaz, close to the...