The Northern Ireland peace process could be heading towards a review, Mr David Trimble warned tonight.
As the RUC questioned two people about the discovery of another pipe bomb factory in Belfast, the Ulster Unionist leader said he could see no immediate end to the deadlock threatening the future of the Belfast Agreement.
He said: "I think the obvious thing to look towards is that if progress isn't achieved in the current talks - and I've no reason to believe it will be - then we need to move towards a formal review of the Agreement with the purpose of devising and sustaining workable democratic structures."
Mr Trimble's warning came as the Taoiseach also said time could be running out in attempts to agree a deal on IRA disarmament, policing and demilitarisation.
He said: "We have given it everything we've got and we've moved everyone considerably.
"We've moved, the British government has moved and everybody else has moved and it's a question of whether we can call it - and that is an important decision that will have to be made in a matter of days."
Mr Ahern and the British Prime Minister Mr Tony Blair are on stand-by to return to Belfast if agreement can be reached on the three key issues.
Irish and British officials held more talks today and will continue the discussions next week but Mr Trimble's warning on BBC radio confirmed the serious differences between all sides involved in the desperate bid to negotiate terms which will guarantee the future of the powersharing executive at Stormont.
Another review would mean the suspension of the government and Assembly for a second time as happened last year when Ulster Unionist threatened to pull out because of the IRA's failure to start emptying their arms dumps.
PA