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
A widespread frost across the UK as temperatures fall below freezing under clear skies.
After a vote tainted by reports of ballot-box stuffing and forced voting, Putin said Russia was ready to 'cooperate' with Britain.
Largely dry elsewhere tonight with a widespread frost and icy stretches