June 5 (Reuters) - The United Nations said on Friday it is deeply concerned by violent protests outside its offices in Libya this week and blamed social media for fueling disinformation about the world body's work in the country.Hundreds of Libyan demonstrators blocked off the office of the U.N. refugee agency (UNHCR) in Tripoli on Thursday during a protest against migrants who travel to Libya in search of work or passage to Europe.

Hundreds of Libyans gathered outside the UN refugee agency headquarters in Tripoli on Thursday to protest against irregular migrants and refugees they say should leave Libya.

The protest is the largest recent anti-migrant demonstrations, with Libyans blaming migrants for social and economic problems