In Afghanistan, four NATO soldiers including three from US were killed in the latest incidents of violence. Two US soldiers were killed yesterday when a suicide bomber struck a convoy of US forces in southern Afghanistan. One US solider was killed when Taliban militants fired rocket-propelled grenades at a patrol late Thursday in eastern Afghanistan while another British soldier died of roadside bomb.<br/><br/>Meanwhile, Taliban militants burned two fuel tanker trucks yesterday in the northern province of Kunduz, nearly a month after an air strike on militant-hijacked petrol trucks in the same province killed more than hundred people. The trucks were transporting fuel to NATO forces from the Tajikistan border and were on their way to Kabul when<br/>they were ambushed by the Taliban.