Desk Report: More than 1,500 Syrian refugees fled to Turkey on Thursday as President Bashar al-Assad’s military crackdown on protests swept up to the border, Turkish officials said on Friday. The European Union meanwhile extended sanctions against Syrian and Iranian officials.

The local government in Turkey’s Hatay province said the new wave of refugees who crossed the border on Thursday, mostly from makeshift camps just inside Syrian territory, brought the total number now registered in Turkish camps to 11,739.

Reuters reporters in Guvecci, a Turkish village at the frontier, said the camps on the other side of the border fence appeared to be completely deserted on Friday morning and they saw no more refugees crossing.

Assad’s repression of the three-month old protests, in which Syrian rights groups say more than 1,300 civilians have been killed, has triggered Western condemnation and a gradual escalation of U.S. and European Union sanctions.

On Friday the European Union announced extended sanctions on Syria, including three commanders of Iran’s Revolutionary Guard accused of helping Damascus curb dissent. Syria denies Iran has played any role in tackling the unrest. According to the EU’s Official Journal, the Iranians were Major-General Qasem Soleimani and Brigadier Commander Mohammad Ali Jafari of the Revolutionary Guard, and the Guard’s deputy commander for intelligence, Hossein Taeb. Four Syrian officials were also targeted, bringing to 34 the number of individuals and entities on the list which already includes Assad and his top officials.

The United States, which has also imposed targeted sanctions on Syrian officials, said the reported Syrian army move to surround and target the town of Khirbat al-Joz just 500 meters (yards) from the Turkish border was a worrying new development.

“Unless the Syrian forces immediately end their attacks and their provocations that are not only now affecting their own citizens but (raising) the potential of border clashes, then we’re going to see an escalation of conflict in the area,” U.S. Secretary of State Hillary Clinton said. Syrian soldiers took up positions close to the border on Thursday and army armored personnel carriers on the road crossing the hills.

Foreign Minister Ahmet Davutoglu spoke with Syrian Foreign Minister Walid al-Moualem on Thursday and Ankara summoned the Syrian ambassador, reflecting the growing disquiet in Turkey. Turkey’s 2nd Army Commander visited the Guvecci border post to take stock of the new troop deployments. “I conveyed our concerns in a comprehensive way,” Davutoglu said of his talks with Moualem as he arrived at parliament in Ankara on Friday.

At the border, only a handful of Syrian troops were visible on Friday, some occupying a prominent building at the top of the hill overlooking the border, directly across from Guvecci. Three Syrian soldiers could also be seen at sand-bagged machine gun post established on top of a house in the Syrian border village of Khirbat al-Joz.