U.K. Prime Minister Seeks U.S. Help Against Terrorists Online

David Cameron is to urge Barack Obama to pressure Internet firms such as Twitter and Facebook to do more to cooperate with Britain’s intelligence agencies as they seek to track the online activities of Islamist extremists. As he becomes the first European leader to meet the president after the multiple shootings in Paris, the prime minister will seek to win Obama’s support for his plans to secure a new legal framework to deny terrorists a "safe space."