AKCAKALE, Turkey — Syrian Kurdish fighters closed in on the outskirts of a strategic Islamic State-held town on the Turkish border Sunday, Kurdish officials and an activist group said, potentially cutting off a key supply line for the extremists' nearby de facto capital.
Taking Tal Abyad, some 80 kilometers (50 miles) north of the Islamic State stronghold of Raqqa, would deprive the group of a direct route to bring in new foreign militants or supplies. The Kurdish advance, coming under the cover of intense U.S.-led coalition airstrikes in the area, also would link their two fronts and put even more pressure on Raqqa as Iraqi forces struggle to contain the group in their country.
Meanwhile, hundreds of Syrian civilians trying to flee the offensive pressed against the barbed wire fences separating the town from Turkey, as masked militants likely belonging to the Islamic State group could be seen while Turkish soldiers watched from the other side.
Turkish Deputy Prime Minister Numan Kurtulmus speaking on the refugee situation at the crossing between in Tal Abyad and Akcakale, claimed that those refugees were not fleeing fighting between Kurds and the Islamic State group, but were rather trying to escape to Turkey in case their villages are hit by U.S.-led coalition bombings.
He said Turkey was providing humanitarian aid to them on the other side of the border while taking in anyone who is sick or injured. Kurtulmus said Turkey has taken in more than 2 million refugees since 2011.
"We are of the opinion that there isn't a humanitarian tragedy there," Kurtulmus told CNN-Turk television in an interview. "Our priority is for them to remain within their border. We will continue to provide humanitarian aid to them"
On Sunday, Kurdish official Idriss Naasan said that Islamic State fighters have fled from Suluk, a few kilometers (miles) southwest of Tal Abyad, and that Kurds now hold the town. The Britain-based Syrian Observatory for Human Rights also said Islamic State fighters had withdrawn. The Observatory said the Kurds are about 5 kilometers (3 miles) from Tal Abyad.
"It's only a matter of time before this area is liberated," Naasan told The Associated Press by telephone from northern Syria, saying the Kurds surround Tal Abyad from the east, west and south. The Turkish border — and the soldiers there — now hem the extremists in from the north.
However, Rami Abdurrahman, who heads the Observatory, said Islamic State fighters still control the road linking the Turkish border with Raqqa.
Since the beginning of May, members of the main Syrian Kurdish force, the People's Protection Units, or YPG, have taken more than 200 small Kurdish and Christian towns in northeastern Syria, as well as strategic mountains seized earlier by the Islamic State group.
They have pushed into Raqqa province, a stronghold of the Islamic State group. Along the way, they have picked up ammunition, weapons and vehicles left behind by the jihadis, almost mirroring the way the extremists overran Iraqi positions last year in their sweep across a third of that country.
The Islamic State group has declared areas of Syria and Iraq it holds as part of its self-declared caliphate, demanding the loyalty of the world's Muslims. Their gruesome propaganda videos of mass killings have drawn in foreign fighters, many coming in over the border from Turkey.
Even if the Kurds cut off Tal Abyad from Raqqa, the Islamic State group could bring in fighters across the border in Syria's Aleppo province, where they still hold ground. However, that would be an indirect route that could expose them to other fighting amid the long Syrian civil war against President Bashar Assad.
In Syria, a country now split mostly between Islamic militants and forces loyal to Assad, the U.S. has found a reliable partner in the YPG, the country's strongest Kurdish militia. They are moderate, mostly secular fighters, driven by revolutionary fervor and a desire to eventually have a nation of their own carved out in the region.
U.S. airstrikes continued Sunday in the area, as an Associated Press journalist on the Turkish side of the border from Tal Abyad saw one strike east of the town.
Nasser Haj Mansour, a defense official in Syria's Kurdish region, said YPG officials are coordinating with the U.S.-led coalition regarding a possible attack on Tal Abyad. He added that the aerial coverage prevented the Islamic State group from bringing reinforcements to the area.
Mroue reported from Beirut. Associated Press writer Suzan Fraser in Ankara, Turkey contributed to this report.