The number of Syrians who have crossed the border stood at 8,421, according to Turkey's disaster and emergency management directorate.

Their flight has been spurred by violence and a military offensive in the country, and Turkish officials are worried that the border crisis could deteriorate and destabilize the region.

World powers have been outraged at the violence, and at least 54 countries are backing a tough resolution on Syria that was to be issued on June 15 at the UN Human Rights Council in Geneva, Switzerland.

Syrian security personnel have been carrying out a fierce crackdown against anti-government demonstrators over the past three months. In its draft joint statement about Syria, the UN Human Rights Council noted that more than 1,000 people "peacefully protesting for democracy" have been killed.

"The continued violence, multiday curfews and military lockdowns are restricting access to basic goods and services, such as health care, medicines and food, causing great concern for the situation of children, the elderly, the sick and wounded, as well as refugees and other vulnerable groups. Injured and wounded people must be allowed to seek treatment without fear of reprisals," it said.

Turkish Prime Minister Recep Tayyip Erdogan met for nearly three hours with the envoy, who was expected to provide an assessment of the refugee situation and the wider political unrest in Syria, according to an official from Erdogan's office.