At least 16 patients being treated at a makeshift hospital in the northern Sri Lankan war zone were killed by shelling, AP qouted the Red Cross as saying today. The United Nations, meanwhile, said it was outraged by the «unnecessary» deaths of hundreds of people inside rebel territory and urged both sides to avoid fighting in civilian areas. The government accuses the Tamil Tiger rebels of holding civilians hostage in the war zone to use as human shields against the military's offensive. The rebels deny the accusation.