The number of the escaped prisoners is ______.

Prison service staff in Britain have been severely criticized in an official report for the escape of five IRA prisoners and an armed robber from White mall Prison, Cambridge shire. Bomb-making equipment was subsequently discovered at the jail. The government has announced a major review of prison security throughout England and Wales. A new task force will be set up under the Home Office and a detailed list of recommendations is expected to be issued at the end of the year.