UN Secretary-general Ban Ki-moon's special envoy to Libya has traveled to Benghazi, an opposition stronghold in the east of the country, to meet with representatives of the Libyan opposition, a UN spokesperson said?on Friday, without giving any further details.

"On Thursday, the special envoy (Abdul Ilah Al-Khatib) met in Ankara with the Turkish foreign minister and in Rome with the Italian foreign minister to discuss the ongoing crisis in Libya in the framework of the implementation of Security Council Resolutions 1970 and 1973," Martin Nesirky, the UN spokesperson, said at a daily press briefing.

UN Security Council Resolution 1970 imposed an arms embargo against Libya and slapped sanctions on members of Libyan leader Muammar Gaddafi's inner circle. Resolution 1973 authorized a no- fly zone over Libya.

Next week, Al-Khatib will brief the Security Council about his activities in support of a peaceful solution for the Libyan conflict, Nesirky said.

Meanwhile, the UN Refugee Agency (UNHCR) has said it remains " very concerned" that people fleeing Libya could be caught in the crossfire, as government and opposition forces fight for control in the border area with Tunisia, Nesirky added.

Clashes have escalated at the Dehiba border crossing between Libya and Tunisia, stopping the outflow of refugees from Libya's western mountains, UNHCR reported.

On Thursday, the World Food Program (WFP) warned that Libya is at risk of a full-blown food security crisis within the next 45 to 60 days.