The Prison Service is investigating how Massey managed to elude staff.
A Prison Service spokesman said:
This continues to be the subject of a thorough ongoing investigation and Mr Massey will be returned to prison custody as soon as possible.
We always press for the heaviest penalties for those who escape or attempt to escape.
More top news
Defence Secretary Michael Fallon has said Boris Johnson's comments about Saudi Arabia "playing proxy wars" were taken out of context.
Home Office files on the Battle of Orgreave are due to be released next year among a host of records relating to the 1984 miners' strike.
Tara Christmas's kitten Elsa was put on a drip when she collapsed last Christmas after eating the leaves of the festive plant.