A "potentially dangerous" murderer has gone on the run for the third time after escaping over the walls of Pentonville Prison using a makeshift rope.
John Massey, one of Britain's longest-serving prisoners, made off from the category B jail in Islington, north London, at around 6.30pm yesterday.
The 64-year-old used a makeshift rope to escape over a wall and was not spotted in time by prison officers, sources said.
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