LONDON - Four men arrested on suspicion of organizing terrorist training camps in Britain were tracked by Spanish investigators earlier this year as they traveled through Spain from France en route to North Africa, officials said Monday. The statement from Spain's interior ministry was the first public indication of an international link to the probe, which led to the arrests late Friday and early Saturday of 14 people suspected of training and recruiting for terror attacks. British prosecutors, meanwhile, said eight other people allegedly involved in a separate plot to blow up U.S.-bound aircraft are unlikely to be brought to...