1 May 2011 Last updated at 11:49 ET
The UN is withdrawing all its international staff from the Libyan capital Tripoli following a mob attack on its offices, the BBC understands.
UN buildings and some foreign missions were targeted by angry crowds following a Nato air strike that reportedly killed a son of Col Gaddafi.
A UN official told the BBC its staff would withdraw from Libya and the decision would be reviewed next week.
The UK expelled the Libyan ambassador after its premises were attacked.
UK Foreign Secretary William Hague said ambassador Omar Jelban was "persona non grata" and had been given 24 hours to leave the country.
By not protecting diplomatic missions, the Gaddafi regime had "once again breached its international responsibilities and obligations", said Mr Hague.
He added: "The attacks against diplomatic missions will not weaken our resolve to protect the civilian p
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