Colonel Muammar Gaddafi must not be allowed to succeed in crushing the popular uprising against his rule, David Cameron said today, as he continued to make the case for a no-fly zone over Libya.
The Prime Minister said the formal call from the Arab League at the weekend for a military no-fly zone to protect the population from attack by the regime's warplanes marked a "very significant step forward".
In a Commons statement, he did not rule out the possibility of arming the Libyan rebels - although he acknowledged that there were difficulties, including the continuing United Nations arms embargo on Libya.
Foreign secretary William Hague - who is meeting G8 foreign ministers in Paris - said the international community was approaching the "point of decision" on military intervention.
But while France also continued to stress the need for action, Germany was more cautious - reflecting the continuing divisions within the international community on how to handle the issue.
Mr Cameron told MPs that time was running out for the Libyan rebels as Colonel Gaddafi's security forces continued to strike back against them.
"Every day Gaddafi is brutalising his own people. Time is of the essence," he said.
"We have seen the uprising of a people against a brutal dictator, and it will send a dreadful signal if their legitimate aspirations are crushed, not least to others striving for democracy across the region."
He also indicated that he would look at a call by the former foreign secretary Sir Malcolm Rifkind to start supplying arms and other military equipment to the rebels who are currently out-gunned by the regime forces.
"We should not exclude various possibilities and there is an argument to be made here," he said.
Mr Hague indicated that while the "cleanest and simplest" way of securing a legal basis for a no-fly zone would be a resolution of the United Nations Security Council, it was not necessarily essential.
"In cases of great, overwhelming humanitarian need, then nations are able to act under international law, even without a resolution of the Security Council," he told the BBC.
But with the US administration cautious about imposing a no-fly zone, German foreign minister Guido Westerwelle said that there were still important issues to be resolved.
He pointed out that while the Arab League supported a UN-approved no-fly zone, it had also rejected any form of foreign military intervention in Libya.
"These are questions that have to be discussed, these are not clear signals being sent, because a no-fly zone would be a military intervention," he said.
He said the Arab League would need to "not just support but also participate" in any action against the Gaddafi regime beyond targeted sanctions.
He also stressed that Germany did not want to be drawn into a long-lasting war in north Africa - a point echoed by some senior Conservative backbenchers in the Commons.
Mr Cameron, however, insisted that "no-one is talking about invasions or boots on the ground".Reuse content