Al Qaeda-linked Nusra Front attacks Western-backed rebels in N. Syria

The al Qaeda-linked Syrian Nusra Front Friday attacked Western-backed rebels on Friday, escalating tension between rival insurgent groups near the Turkish border. Warplanes of the US-led coalition bombed the Nusra positions near Azaz, north of Aleppo. The fighting, believed to have killed at least 13 people on both sides, raises a major complication for US-Turkish plans to drive Islamic State militants from northern Syria.