Britain has revoked the diplomatic immunity of Libyan leader Muammar Gaddafi and his family, Foreign Secretary William Hague has said as he called on him to step down.
The United Nations Security Council unanimously voted earlier to refer the brutal repression of the popular Libyan uprising to the International Criminal Court.
Sanctions also included a freeze on the assets of Mr Gaddafi and his immediate family and a global travel ban on the embattled ruler and his close associates.
Mr Hague also said the UK was "working intensively" to establish how many Britons remained in Libya as final evacuation missions were being planned.
Dozens of oil workers were dramatically rescued by military aircraft from remote desert locations on Saturday night in a secret mission involving British special forces.
Meanwhile, the UN Security Council has unanimously imposed sanctions in the form of travel bans and asset freezes on Libyan leader Muammar Gaddafi and his family.
The resolution adopted by the 15-nation council also called for the immediate referral of the deadly crackdown against anti-government demonstrators in Libya to the International Criminal Court in The Hague for investigation and possible prosecution of anyone responsible for killing civilians.
