David Cameron

Britain's Prime Minister, David Cameron, makes a statement to the media on the killing of British aid worker David Haines in Downing Street, central London, Sunday Sept. 14, 2014. In an emotional statement after chairing a meeting of the Government's Cobra emergency committee to discuss the killing, he hailed David Haines as a "British hero" and vowed to "hunt down those responsible and bring them to justice no matter how long it takes." (AP Photo/PA, John Stillwell) UNITED KINGDOM OUT NO SALES NO ARCHIVE