He said the U.K. needs a stronger national identity to prevent people turning to extremism.
"If we are to defeat this threat, I believe it's time to turn the page on the failed policies of the past," he told an international conference in Munich.
"Under the doctrine of state multiculturalism, we have encouraged different cultures to live separate lives, apart from each other and the mainstream,” Cameron said during a panel discussion attended by German Chancellor Angela Merkel. “We have failed to provide a vision of society to which they feel they want to belong.”
He said the “hands-off tolerance” in Britain and other European nations has encouraged Muslims and other immigrant groups “to live separate lives, apart from each other and the mainstream.”
Katie Pavlich is the Editor at Townhall.com. Follow her on Twitter @katiepavlich. She is a New York Times Best Selling author. Her latest book Assault and Flattery: The Truth About the Left and Their War on Women, was published on July 8, 2014.