LONDON - The British Police have foiled an alleged plot by Al-Qaeda members to escape from a British jail in a hijacked helicopter, it is reported. Nine inmates planned to kidnap the jail Imam during prayers with weapons allegedly hidden in the mosque at Full Sutton prison in East Yorkshire. Their plan was to use the Imam as a human shield as they made their way to the jails sports field. Once there, accomplices from the outside were to pick them up in a helicopter hijacked at gunpoint after being hired for 'business. Acting on a tip-off, wardens at the jail swooped on the inmates hours before the escape attempt was due to begin on Friday. The nine men - who included convicted terrorists - were immediately segregated from other inmates and will now be transferred to different prisons. The jails Imam is not believed to have been involved in the plot. One high-profile Al-Qaeda member being held at the jail is Omar Khyam, who was sentenced to a minimum of 20 years in 2007 for leading a gang that planned to blow up Londons Ministry Of Sound nightclub and Bluewater Shopping Centre in Kent. The intelligence was very strong and from a good source, an insider told The Sun. It had to be acted on immediately. It involved some of the most dangerous Al Qaeda terrorists in jail, all of whom are a massive threat. It had been planned for months and the use of a helicopter shows it was sophisticated. The nine may have been inspired by the February escape of notorious Greek criminal Vassilis Paleokostas, who escaped with another man from a high security prison near Athens. Accomplices hijacked a helicopter and picked up the pair by dropping a rope ladder into the prisons exercise yard. It was the second time Paleokostas had escaped from jailed in such a fashion. British Ministry of Justice spokeswoman on Tuesday said: Vigilant staff at Her Majestys Prison Full Sutton uncovered details of a possible escape plot on Friday. The prisoners involved were immediately separated and the Prison Service is investigating the matter. Full Sutton is a maximum security prison which houses more than 600 men, including many lifers.