At a glance
• Up to 40 more prisoners could be wrongly released before Christmas, with errors now averaging 22 a month and 262 inmates released by mistake in the year to March
• Two inmates, convicted sex offender Brahim Kaddour-Cherif and fraudster Billy Smith, are currently on the run after being mistakenly freed from HMP Wandsworth
• The government has launched an urgent review, summoned prison governors, and brought in tech experts to address chaotic release processes
David Lammy has admitted that the Government has a "mountain to climb" in tackling the prisons crisis as it emerged that 40 more inmates may be wrongly freed before Christmas.