The Northern Ireland Secretary of State is to write to all IRA suspects in receipt of letters under the terms of the Good Friday agreement outlining that they can still face questioning or prosecution.

The letters, which effectively granted immunity from arrest, led to the collapse of the trial of John Downey (62), who was suspected of involvement in the 1982 Hyde Park bombing.

The British Prime Minister David Cameron said there would be a judge-led inquiry into the agreement that led to 187 letters being sent to Republican paramilitaries as part of the on-going peace process.

Yesterday the Northern Ireland First Minister Peter Robinson threatened to quit if there was no review of the guarantee given to Mr. Downey, saying he was "kept in the dark" by the British government.

But Mr. Robinson welcomed the announcement of the inquiry today. And he says he is now satisfied with both the inquiry and a statement issued by the Secretary of State Theresa Villiers concerning 'on the run' republicans.

Convicted IRA member Downey, from Donegal, had an outstanding warrant against him when he received the letter in 2007.

The Hyde Park attack killed four people in July 1982.

Mr. Cameron said earlier that the letters should not be seen as any sort of amnesty.