A bomb planted by insurgents has killed a foreign soldier serving with NATO in southern Afghanistan, the deadliest battlefield in the war against Taliban militants, the alliance said Wednesday. The International Security Assistance Force released a brief statement that did not give the nationality of the soldier killed on Tuesday. Most of the troops in the south are Americans, British or Canadians. "An International Security Assistance Force soldier was killed as a result of an improvised explosive device strike by insurgents in southern Afghanistan yesterday," the statement said.