15 April 2011 Last updated at 05:35 GMT
http://www.bbc.co.uk/news/world-africa-13089349
Western leaders insist Gaddafi must 'go'
US, British and French leaders have said in a joint letter there can be no peace in Libya while Muammar Gaddafi stays in power.
Nato and its partners, they say, must maintain military operations to protect civilians and maintain pressure on Colonel Gaddafi's government.
To allow him to remain in power, they argue, would be a betrayal of the Libyan people.
The BBC's Tom Burridge reports from Washington