Some 13,000 refugees have already crossed into Turkey in the last 10 days, according to the Turkish Foreign Ministry. Hundreds more could be seen Saturday on the Syrian side of the Akcakale border crossing, waiting to cross into Turkey.
A statement by the main Syrian Kurdish fighting force, known as the YPG, said its fighters have encircled the Islamic State-held town of Suluk, a few kilometers (miles) southwest of the strategically important town of Tal Abyad.
The report could not be immediately confirmed. The Britain-based Syrian Observatory for Human Rights said the Kurds were less than 10 kilometers (six miles) away from Tal Abyad.
The loss of Tal Abyad would be a major blow to the IS group.
The border town is a major avenue for commerce for the extremist group through which it smuggles in foreign fighters and sells black-market oil.
The city is also a key link between Turkey and the northern Syrian city of Raqqa, the de-facto capital of the Islamic State group's self-declared caliphate.
They are moderate, mostly secular fighters, driven by revolutionary fervor and deep conviction in their cause.
Since the beginning of May, they have wrested back more than 200 Kurdish and Christian towns in northeastern Syria, as well as strategic mountains seized earlier by the IS group.
They have recently 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.
At one point, a group of armed, masked men likely IS militants approached them and ordered them to return to the town. Fearful, many of them turned back, only to return after about 15 minutes.
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