The US Air Force has confirmed it has lost contact with the a F-16 fighter jet that left an air base in Italy earlier today and the status of the pilot is "unknown", the Associated Press reported.
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Arthur Simpson-Kent, 48, admitted killing Ms Blake and their sons according to his lawyer.
Two brothers have been arrested on suspicion of murder after their parents were found dead in their own home over the weekend.
The first man to be convicted of murder on the basis of DNA evidence should be moved to an open prison, according to the Parole Board.