The ceasefire in northeast Syria got off to a rocky start on Friday, as Turkish President Recep Tayyip Erdogan warned he would resume a full-scale operation against Kurdish forces if they do not withdraw from a border "safe zone", Al Jazeera reports.
Speaking to reporters in Istanbul, Erdogan said the Kurdish forces must withdraw "without exception" from a swathe of land 30km (18.6 miles) deep inside Syria, running 440km (273.4 miles) along Turkey's eastern border with Syria.
"If the promises are kept until Tuesday evening, the safe zone issue will be resolved," Erdogan said.
"If it fails, the operation ... will start the minute 120 hours are over."
Ankara considers the Kurdish forces to be "terrorists" linked to Kurdish rebels inside Turkey and wants the fighters pushed back from its border. It says the "safe zone" it wants to create inside Syria would also make room to settle up to two million Syrian war refugees - out of the 3.6 million it is currently hosting.