EDITORS PLEASE NOTE -- THE STORY CONTAINS GRAPHIC IMAGES<br/> <br />A suicide bomber kills at least 10 people, including four U.S. troops in Northern Afghanistan Wednesday.<br/> <br />Afghan police say the soldiers strayed from their base to take photographs in a park, in a relatively peaceful part of the country.<br/> <br />Four civilians and two Afghan policemen were also killed in the attack, which came ahead of the traditional summer fighting season.<br/> <br />More than 2,900 foreign soldiers have died in Afghanistan since the war was launched more than a decade ago.<br/> <br />Deborah Lutterbeck, Reuters.