BBC: The UK has taken steps to expel five Libyan diplomats, Foreign Secretary William Hague has said.
Updating MPs, Mr Hague said the five - which include the military attache - "could pose a threat" to UK security.
Meanwhile, David Cameron said the UK was not ruling out providing arms to rebels in "certain circumstances" but no decision had yet been taken.
Shadow foreign secretary Douglas Alexander questioned the legality and "advisability" of such a move.
The rebels are continuing to lose ground to forces loyal to Colonel Gaddafi and are retreating from their former strongholds along the eastern coast of Libya.
Earlier, the prime minister's official spokesman rejected suggestions the UK's stance on the possibility of supplying weapons to them had shifted in recent weeks.
'Grave concern'
The coalition military action is aimed at enforcing a no-fly zone over Libya and protecting civilians from attacks by forces loyal to its leader Col Gaddafi. It has denied air strikes are meant to provide cover for a rebel advance.
The foreign secretary's statement came after the allies held a summit in London on Tuesday to discuss Libya's future.
Mr Hague said: "To underline our grave concern at the [Gaddafi] regime's behaviour, I can announce to the House that we have today taken steps to expel five diplomats at the Libyan embassy in London, including the military attache.
"The government also judged that, were these individuals to remain in Britain, they could pose a threat to our security." (+ video) » | Wednesday, March 30, 2011
