The UK "must prepare for the long haul" in Libya, Downing Street has said.
Earlier Foreign Secretary William Hague briefed the cabinet about the situation in Libya.
Number 10 said progress was being made in putting greater pressure on Libyan leader Colonel Muammar Gaddafi and there were "grounds for optimism".
RAF fighter aircraft "successfully attacked" three armoured personnel carriers near the besieged city of Misrata over the weekend.
But a spokeswoman for the prime minister said: "We must prepare for the long haul."
She said this was not a new policy, simply a broad statement of fact, adding: "It is just sensible planning to enforce United Nations Resolution 1973."
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Syria next?
