British Prime Minister David Cameron leaves Number 10 Downing Street to travel to the House of Commons to deliver a statement on the unfolding hostage situation in Algeria on January 18, 2013 in London, England. Islamist militants had claimed to be holding 41 foreigners hostage at a gas treatment plant in the Algerian desert. At least four hostages and several militants were killed yesterday when Algerian troops stormed an area of the plant.