On Sunday, the Lebanon-based Mayadeen TV said at least 350 Turkey-backed armed rebels had crossed into Syria from Turkey to support extremists fighting against Kurds near Tel Rifaat.
“Kurdish fighters began storming the city of Tel Rifaat from the northern flank. One of the largest al-Nusra Front’s stongholds is there. The city is of strategic importance and is on the road leading from Turkey,” the source told RIA Novosti.
In particular, the Syrian Army and the National Defense Forces (NDF) have managed to cut off several main supply lines of al-Nusra Front militants in the town of Mayer located between the city of Aleppo and the country's border with Turkey.
On Sunday, NTV channel reported citing a military source that Turkish forces have continued to shell YPG positions in Syria killing two Kurdish fighters.
Later, Turkish Prime Minister Ahmet Davutoglu claimed that Turkish forces had shelled Kurds' positions in northern Syria as a "retaliatory measure."