On Aug. 13, US -backed Syrian rebels, led by the Kurdish militia known as the YPG, took control of Manbij from Islamic State, cutting a major supply route between Raqqa, the extremists' de facto capital in Syria, and the Turkish border. Government military forces withdrew from the city in August after street battles with the Kurdish autonomous self-defense force for the region, the YPG.
The loss of the Turkish border will deprive ISIS of a key transit point for recruits and supplies, though the group continues to hold territory in both Syria and Iraq.
Once Syria's economic powerhouse, the city has been ravaged by the war that began with anti-government protests in March 2011.
The Britain-based Syrian Observatory for Human Rights said Daesh "has lost its link with the outside world after losing all border areas" with Turkey.
Turkish security forces used tear gas and water cannon to disperse protesters along the border on Friday. Al-Rai is about 55 kilometers west of Jarablus.
Turkish forces, including tanks and other armored vehicles, crossed the border into the Syrian province of Aleppo and shelled Daesh positions.
Moscow has backed Assad in the war and Russian warplanes have targeted the opposition for almost a year, while Washington has supported some rebel groups fighting under the banner of the Free Syrian Army to topple him.
The question of the Kurdish militias has complicated cooperation between Turkey and the US, NATO allies and partners in their fight against ISIS in Syria.
Turkish authorities are also building a wall to boost security along a stretch of its border with Syria, Anadolu reported.
Asked how the Turkish-led offensive had been able to secure a stretch of 55km in just two days, mopping up a dozen or more towns and villages, Mr Abdulrahman said: "Isis have stopped fighting there, they are moving out".
Turkish Air Force launched an operation August 24 with support of the coalition aircraft to liberate Syria's Jarabulus from the IS militants.
In Hangzhou, China, meanwhile, President Barack Obama said the USA and Russian Federation have not given up on negotiations to halt the bloodshed in Syria, but acknowledged that "gaps of trust" exist between the rival powers.
"We do not have the chance to take a backward step".
"We're not there yet", Obama told reporters Sunday.
"To the extent that there are children and women and innocent civilians who can get food and medical supplies and, you know, get some relief from the constant terror of bombings, that's worth the effort", he said. Doing so may result in civil and/or criminal penalties. Turkish President Recep Tayyip Erdogan said in a joint press conference with President Obama in China that "our wish is that a terror corridor does not form on our southern border".
Also Sunday, the United States and Russian Federation struggled to keep alive negotiations to end the bloodshed between US-backed rebels and Syria's Russia-aligned regime.
Meanwhile the war grinds on.
Also on Sunday, Syrian government forces put rebel-held districts in the east of Aleppo under siege once again, monitors said. Since then, government forces and their allies have been trying to recapture the area.
However, the US sees the YPG militia as an important strategic part of the USA -led anti-IS coalition and has provided them with extensive aid and air strikes.
Separately, Syrian state forces recaptured parts of Aleppo lost to rebels last month. The "Islamic State" (IS, ISIL, ISIS or Daesh), the YPG and the PYD are the most active terrorist groups in Syria.