Protesters have climbed on to the top of the Libyan embassy building in London, police said today.
Officers were alerted at around 2.50am after a small group of people gained access to the roof of the building in Knightsbridge.
A Metropolitan Police spokesman said: "They removed a flag from the flagpole and attempted to replace it with another. At present those on the roof remain there.
"It is believed there are up to five people on the roof."
Protesters have gained access to a room near the roof, but not the main building.
Two men, aged 25 and 26, who also tried to climb the building were arrested on suspicion of attempted trespass on diplomatic premises and have been taken to a London police station.
Police said they were speaking with the group in an attempt to "secure a safe resolution".
The protesters could be seen holding their fists defiantly in the air, with one displaying a "V" sign, next to two unfurled flags from the pre-Gaddafi era.
Approximately 10 officers were present at the base of the four-storey building, according to one onlooker.
It comes amid continuing unrest in Libya as rebels clash with Muammar Gaddafi's forces.
Britain is increasing the pressure for a no-fly zone over Libya by tabling a draft resolution at the UN Security Council.
Last week squatters occupied a house in north London thought to be owned by Saif al-Islam Gaddafi, the second son of the Libyan dictator.
A group calling themselves "Topple the Tyrants" entered the home in Hampstead Garden Suburb, claiming the property "belongs to the Libyan people".Reuse content