Traces of radiation have been found at more locations in central London by police investigating the death of former Russian spy Alexander Litvinenko. Scotland Yard have confirmed that polonium 210, the same substance found in Alexander Litvinenko's body, had been discovered at two addresses in London's West End. Three people have been referred to a specialist clinic where they are being tested for possible contamination. This followed hundreds of calls to a special hotline. In an emergency statement to MPs, Home Secretary John Reid said the Russians had been told to co-operate with the investigation.