In this photo taken from the Turkish side of the border between Turkey and Syria, in Ceylanpinar, Sanliurfa province, southeastern Turkey, smoke billows from targets in Ras al-Ayn, Syria, caused by shelling by Turkish forces, Friday, Oct. 18, 2019. Fighting continued in a northeast Syrian border town at the center of the fight between Turkey and Kurdish forces early Friday, despite a U.S.-brokered cease-fire that went into effect overnight. Shelling and gunfire could be heard in and around Ras al-Ayn, as smoke billowed from locations near the border with Turkey and the Turkish town of Ceylanpinar. (AP Photo/Lefteris Pitarakis)
In this photo taken from the Turkish side of the border between Turkey and Syria, in Ceylanpinar, Sanliurfa province, southeastern Turkey, smoke billows from targets in Ras al-Ayn, Syria, caused by shelling by Turkish forces, Friday, Oct. 18, 2019. Fighting continued in a northeast Syrian border town at the center of the fight between Turkey and Kurdish forces early Friday, despite a U.S.-brokered cease-fire that went into effect overnight. Shelling and gunfire could be heard in and around Ras al-Ayn, as smoke billowed from locations near the border with Turkey and the Turkish town of Ceylanpinar. (AP Photo/Lefteris Pitarakis) Credit: Lefteris Pitarakis

The cease-fire in northern Syria got off to a rocky start Friday, as Kurdish leaders accused Turkey of violating the accord with continued fighting at a key border town while casting doubt on provisions in the U.S.-brokered deal with Ankara.

Turkey’s president warned that Turkish forces would go back on the attack in four days unless Kurdish-led fighters withdraw “without exception” from a zone 20 miles deep in Syria running the entire 260-mile length of the border.

“Without exception, if the promise is not fulfilled, Operation Peace Spring will resume the minute the 120 hours end with even more determination,” President Recep Tayyip Erdogan told journalists in Ankara.

There was no sign of any pullout by the Kurdish-led forces. They say the deal only covers a much smaller section of the border, about 75 miles and haven’t committed to pull out from anywhere.

Some fighters have vowed not to withdraw, calling the accord an “insult to Kurdish dignity” and tantamount to a surrender arranged by the U.S., the former ally that abandoned them to the Turkish assault.

The Kurdish self-administration said some provisions of the cease-fire deal “need further discussion with the United States,” though it did not specify what. A senior Kurdish politician, Ilham Ahmed, was due in D.C. over the weekend to meet U.S. officials.