Five more US soldiers have been killed in Afghanistan, sending Nato's death toll to 12 in 24 hours. Four soldiers belonging to the International Security Assistance Force were killed by a bomb in southern Afghanistan, Nato said. Another US soldier died in a separate attack also in the south of the country.It comes a day after three US soldiers and five Afghan civilians died in a suicide attack in Kandahar province. The latest deaths came as a major manhunt was under way in Helmand province for the rogue Afghan soldier who killed three British soldiers from the Royal Gurkha Rifles on Tuesday.A British Royal Marine was also killed on Tuesday in a separate incident in Helmand province. So far in July, 45 international troops have died in Afghanistan, 33 of them from the US. June saw more than 100 international troops killed – the bloodiest month of the nine-year-old war.