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
Common antibiotics may double the risk of miscarriage in early pregnancy, research has shown.
Outbreaks of rain are set to sweep across the country, getting heavy and thundery in places.
Owners must also prove they have something to pick up dog mess with under new rules imposed by one council.