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Europe's leaders, have been warned to adopt a more "cautious" approach when discussing multiculturalism. The Norwegian chairman of the Nobel peace prize committee has told them they risk inflaming far-right and anti-Muslim sentiment. Thorbjørn Jagland, a former prime minister of his country, said leaders such as the British premier would be "playing with fire" if they continued to use rhetoric that could be exploited by extremists. Four months ago in Munich, Cameron declared that state multiculturalism had failed in Britain, a view immediately praised by Nick Griffin, leader of the BNP, as "a further huge leap for our ideas into the political mainstream". Marine Le Pen, vice-president of the far-right National Front party in France, also endorsed Cameron's view of multiculturalism, claiming that it corroborated her own party's line. Jagland's comments come in the wake of the Oslo bomb and the massacre on Utøya Island that left 77 people dead. The killer, Anders Behring Breivik, said he was inspired by the right-wing English Defence League. Breivik sent his manifesto, published online hours before the attacks, to about 250 British members of the BNP, the EDL and the Stop Islamisation of Europe group. Jagland, who is also secretary general of the Council of Europe, told the Observer: "We have to be very careful how we are discussing these issues, what words are used. "Political leaders have got to defend the fact that society has become more diverse. We have to defend the reality, otherwise we are going to get into a mess. I think political leaders have to send a clear message to embrace it and benefit from it.