Turkey-backed Syrian opposition forces who are fighting Syrian President Bashar al-Assad have blocked an attempt by Kurdish groups to establish a corridor connecting Tel Rifaat to northeastern Syria, Turkish security sources said on Sunday. Turkey refers to this group as the Syrian National Army.For all the latest headlines follow our Google News channel online or via the app.The sources said that Kurdish groups, including the PKK and YPG, had sought to take advantage of Syrian government forces withdrawing from parts of the country under the control of al-Assad’s forces. The corridor would have linked the Kurdish-held northeastern regions to Tel Rifaat, a strategic area northwest of Aleppo. Read more:Iran, Russia foreign ministers say they support Syria amid major opposition attackUS blames al-Assad’s reliance on Russia, Iran for loss of Aleppo controlSyria war monitor says opposition controls ‘most of’ Aleppo city