The United States is refusing to extradite a group of US soldiers arrested for alleged cocaine smuggling in Colombia. US ambassador William Wood says the soldiers are immune from prosecution. Colombian senators have been calling for the men, who were based in the country, to be handed over to Colombian authorities. More than 200 Colombian citizens have been extradited to the US to face trial for drug trafficking, under a bilateral deal between the two countries. Colombian politicians have asked the government to push for the US to hand over the men, to prove that the extradition agreement works both ways.