Cameron holds Libya no-fly talks
The international community cannot "stand aside" and allow brutal repression to continue in Libya, David Cameron said after discussing plans for the "full spectrum of possible responses" including a no-fly zone with US President Barack Obama.
Downing Street said the two leaders had agreed to "press forward" with possible measures as the offensive against rebels intensified with the regime employing rockets, tanks and military aircraft in a bid to end the uprising.
The Prime Minister said it was important not to underestimate the influence of sanctions already taken against the Gaddafi regime - as the European Union appeared set to impose even tougher restrictions against it than those agreed by the United Nations.
But he said he was determined to "prepare for what we might have to do if he (Gaddafi) goes on brutalising his own people".
"I had a phone call with President Obama this afternoon to talk about the planning we have to do in case this continues and in case he does terrible things to his own people. I don't think we can stand aside and let that happen," he told BBC1's The One Show.
Number 10 said the telephone conversation with the White House had agreed an objective of securing "an immediate end to brutality and violence" and the departure of Gaddafi.
"The Prime Minister and the President agreed to press forward with planning, including at Nato, on the full spectrum of possible responses, including surveillance, humanitarian assistance, enforcement of the arms embargo, and a no fly zone," a spokesman said. "They committed to close co-ordination on next steps."
US Secretary of State Hillary Clinton stressed that action had to be taken with the backing of the United Nations not led by the US.
"We'd like this to be resolved peacefully, we'd like to see him go peacefully, we'd like to see a new government come peacefully," she told Sky News.
"But if that's not possible, then we are going to work with the international community. Now, there are countries that do not agree with that. We think it's important that the United Nations make this decision, not the United States, and so far the United Nations has not done that."