Turkey's top brass held talks Wednesday about the activities of Kurdish rebels in Syria, after press reports that they were in control of several northern areas of the conflict-torn nation.

"The latest developments in Syria, the activities of the terrorist separatist group in our country and in neighboring countries were discussed at the meeting," Prime Minister Recep Tayyip Erdogan's office said.

About 300 people fled from Syria into Turkey overnight, amid guarantees by Ankara to keep the border open to refugees, the U.N.'s refugee agency said on Wednesday.

"I can confirm we not only have assurances from the Turkish authorities that borders remain open for Syrians fleeing the violence, but also we know that around 300 people crossed last night," said Sybella Wilkes, spokeswoman for the U.N.'s High Commissioner for Refugees.

Turkey said Wednesday it will keep supplying energy to Syria despite previously threatening to halt exports to its conflict-wracked neighbor.

"The Syrian people need electricity now more than ever. We will continue to provide it," Energy Minister Taner Yildiz said, the Anatolia news agency reported.

Turkey will close its border crossings with neighboring strife-torn Syria on Wednesday until further notice, a Turkish official told Agence France Presse.

"We have taken such a measure for our citizens for security reasons," said the official. "This is an open-ended measure and the reopening depends on the developments on the ground."

Turkish Prime Minister Recep Tayyip Erdogan said the Syrian opposition was close to victory, and warned that Ankara was ready to respond to any "hostile" action by the Damascus regime.

"We think that the Syrian people are closer than ever to victory," Erdogan said at a dinner on Monday, according to the Anatolia news agency.

Turkey recalled its envoy in Aleppo on Monday as rebel fighters clashed with loyalist troops in what is Syria's second-largest city, a Turkish diplomat said.

Turkey's consul for the northern city of Aleppo, Adnan Kececi, had returned to Turkey to discuss the situation in Syria, the source said.

Turkish police fired tear gas on stone-throwing Syrian refugees who were protesting Sunday at the lack of food and water at camps on the border with their conflict-ravaged homeland.

A Turkish official said demonstrations erupted at two of the 10 camps set up along the border which are sheltering about 40,000 Syrians who have fled the escalating violence at home.

Turkey sent batteries of ground-to-air missiles to the border with Syria on Sunday, media reports said, boosting its firepower as rebels in Syria seized several border posts.

As fighting raged in Damascus and Aleppo, rebels were said to have taken control of three crossing points on the border with Turkey, which is sheltering thousands of Syrians who have fled the conflict at home.

Syrian rebel forces occupied a second border post with Turkey on Sunday, three days after taking control of the frontier crossing of Bab al-Hawa, while Syrian forces regained control of a border crossing along the northern frontier with Iraq.

Amateur video distributed by the Syrian Observatory for Human Rights watchdog group showed armed men carrying the flag of the Syrian uprising at the Al-Salama border crossing.

One more Syrian general crossed into Turkey overnight, bringing to 25 the number of generals who have fled the unrest in Syria, a foreign ministry diplomat told Agence France Presse on Sunday.

Turkey has given sanctuary to dozens of army defectors who have formed the Free Syrian Army in opposition to President Bahsar Assad's regime.