The Independent writes that the Litvinenko inquiry is closing in on the suspected killers. There are, however, problems:
Detectives are close to identifying the suspected killers of Alexander Litvinenko, the former Russian agent, but it looks increasingly likely that the alleged assassins will escape prosecution.
Scotland Yard officers are also investigating whether the former spy was first poisoned with polonium-210 several days earlier than previously reported. Investigators believe Mr Litvinenko may have been contaminated twice, with the second attack taking place at a central London hotel several days after the first "hit".
Two Russian businessmen, one a former KGB officer and the other a former Soviet soldier, are the focus of the investigation by anti-terrorist officers from the Metropolitan Police. Both strongly deny any wrongdoing.