Meanwhile, Turkey's PKK Kurdish rebel group on Monday urged fellow Kurds to cross into Syria and combat IS insurgents besieging a town near the border, the pro-Kurdish agency Firat reported.

"The number of Syrians has passed 130,000," Kurtulmus told reporters in Ankara, warning that the number would likely rise.

IS extremists have seized dozens of villages in the past week as they advance on the town of Ain al-Arab, called Kobane in Kurdish, near the border.

"If ISIL attacks continue in the Kobane region, Turkey may face an intensive influx," Kurtulmus said, using one of a handful of alternative names for the IS group.

"We have taken all necessary measures in case of a continued influx of displaced people. We don't want that, of course, but we are ready," he added.

The latest total was a sharp increase from a figure of 104,000 given earlier Monday by Turkey's emergencies directorate.

"I can confirm that the government has now registered 130,000 people who have fled Kobane in the last few days," Melissa Fleming, spokeswoman for the UN refugee agency, UNHCR, said.

"The new figure comes from a combination of new arrivals overnight and a registration process in towns and cities... where they are seeking refuge," she said.

"The borders are being managed to ensure the civilian character of those who arrive."

Until the IS assault, Kobane, the third biggest Kurdish population centre in Syria, had been relatively safe, sheltering 200,000 people displaced from elsewhere in the war-torn country.

A Turkish foreign ministry official told AFP the refugee entries were mainly through border crossings at Cilvegozu and Oncupinar, adding that there were also limited entries through the border crossing at Mursitpinar.

"Some of the refugee are due to stay at their relatives' houses in Turkey, and some will be transferred to the camps," said the official, speaking on condition of anonymity.

- PKK urges 'mobilisation'-

The outlawed Kurdistan Workers' Party (PKK), blacklisted as a terrorist organisation by Turkey and its Western allies, called for "mobilisation," saying, "the day of glory and honour has arrived."

The appeal urged young Kurds in Turkey to join the fight against IS forces around Kobane region.

"We call on our entire people, as well as our friends, to step up the resistance," the PKK statement said.

Turkey entered a truce in March 2013 with Kurdish PKK rebels, seeking self rule in the southeast. But peace talks to end a three-decade insurgency stalled after rebels said Ankara was not doing enough to improve conditions for the Kurdish minority.

After the lightening gains by IS militants in Iraq, Turkey has raised fears that weapons sent by Western countries to forces fighting the radicals may end up in the hands of the Kurdish separatist rebels -- a concern that Ankara conveyed to US Secretary of Defense Chuck Hagel this month.

Turkey had so far refused to get involved militarily in the US-led coalition to defeat jihadists, citing the safety of its dozens of hostages held in Mosul by the militants.

President Recep Tayyip Erdogan signalled Sunday that Turkey may re-evaluate its cooperation with the anti-IS coalition, now that the hostages have been released.