Turkish President Tayyip Erdogan said on Friday that there were no ongoing clashes in northeastern Syria, where Turkey has been carrying out an offensive, after Ankara agreed with Washington to pause its offensive while Kurdish forces withdraw. 

On Friday morning, shelling could be heard at the Syrian-Turkish border despite the five-day ceasefire to clear a planned "safe zone" of Kurdish militia, while the United States said the deal covered only part of the territory Ankara aims to seize. 

However, Erdogan said the "safe zone" would stretch 440 km (273 miles) along Turkey's border with Syria, with its eastern edge on its border with Iraq, and added that a depth of 32 km (20 miles) was agreed on with the United States. 

He told reporters after Friday prayers in Istanbul that U.S. and Turkish officials would be in constant contact to implement the agreement together. 

Erdogan said he informed U.S. President Donald trump in a phone call about launching a Syria offensive a day before starting the operation, and warned that the Syria offensive will continue if a truce agreement is not fully implemented by end of the 120-hour ceasefire. 

He said it's not a problem for Turkey if Syrian forces are in areas cleared of Kurdish forces and Turkey has no goal to remain in areas under its control in Northern Syria. 

"Five civilians were killed in Turkish air strikes on the village of Bab al-Kheir, east of Ras al-Ain," Rami Abdel Rahman, head of the Syrian Observatory for Human Rights, said, referring to Friday's air strikes. 

Mustefa Bali, a spokesman for the SDF, said Turkey was clearly violating the terms of the agreement reached during U.S. Vice President Mike Pence's visit to Ankara on Thursday.

"Despite the agreement to halt the fighting, air and artillery attacks continue to target the positions of fighters, civilian settlements and the hospital," in Ras al-Ain, he said.