Some 45,000 mainly Syrian Kurds have crossed into Turkey in the past 24 hours, officials say, as Islamic State militants advance in northern Syria.
Turkey opened its border on Friday to Syrians who had fled the Kurdish town of Kobane in fear of an IS attack.
Activists say some 300 Kurdish fighters have crossed into Syria from Turkey to help defend the strategic town.
IS controls large areas of Syria and Iraq and has seized dozens of villages around Kobane, also called Ayn al-Arab.
Turkey – which shares a border with Iraq and Syria – has taken in more than 847,000 refugees since the uprising against Syrian President Bashar al-Assad began three years ago.
Villages seized
Turkish Deputy Prime Minister Numan Kurtulmus confirmed on Saturday that 45,000 refugees had crossed the border within a 24-hour period.
“No country in the world can take in 45,000 refugees in one night, bring them here unharmed and find them a shelter without a problem,” he said.
The UK-based Syrian Observatory for Human Rights said at least 300 Kurdish fighters had joined Syrian Kurdish fighters in the Kobane area to fend off the IS advance. The activist group did not specify which Kurdish group the fighters belonged to.
“Islamic State sees Kobane like a lump in the body, they think it is in their way,” the Observatory’s Rami Abdulrahman said.
Syrian activists say IS has seized as many as 60 villages surrounding Kobane since fighting began earlier this week.
The head of Syria’s Kurdish Democratic Union, Mohammed Saleh Muslim, has appealed for international assistance in the battle against the jihadists.
“Kobane is facing the fiercest and most barbaric attack in its history,” Reuters news agency quoted him as saying.
“Kobane calls on all those who defend humane and democratic values… to stand by Kobane and support it immediately. The coming hours are decisive,” he added.
BBC correspondents say the capture of the town would give IS control of a large strip of Syria’s northern border with Turkey.
Hostages freed
In a separate development, 49 Turkish hostages seized by IS have been freed and returned to Turkey after a covert operation led by Turkey’s intelligence agency.
The hostages were seized after IS militants overran Mosul in a rapid advance in June.
Few details about the operation have been released, but Prime Minister Ahmet Davutoglu said Turkey’s “own methods” brought the group home.
“After intense efforts that lasted days and weeks, in the early hours, our citizens were handed over to us and we brought them back to our country,’ Mr Davutoglu said.
Thirty countries have pledged to join a US-led coalition against the militants but Turkey has said it will only allow humanitarian and logistical operations from a Nato air base on its soil.
Turkey has come under pressure from Western countries to stem the flow of foreign fighter joining IS.
President Recep Tayyip Erdogan has said Turkey is developing plans for a buffer zone on its border with Iraq and Syria.
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Source: BBC