Hundreds of Republican terrorism suspects will reportedly learn today that they no longer have immunity from prosecution as the British Government takes back so-called 'comfort letters'.

The Daily Telegraph reports that Theresa Villiers, Northern Ireland's Secretary of State will tell British MPs that the letters are worthless.

It is believed that the PSNI will conduct a review of all of the cases, and new letters will be issued telling suspects that if there's enough evidence against them, they will be prosecuted for terrorist acts.

The comfort letters were issued to on-the-run suspects ahead of the signing of the Good Friday Agreement.

There was uproar in Britain after the collapse of the Hyde Park bombing trial when it emerged Donegal man John Downey was in receipt of such a letter.

It later emerged he was given the letter by mistake.

Belfast-based security correspondent Alan Murray told Newstalk Breakfast many people involved in the scheme are still unknown.