At that time, a Prison Service spokesman said no Semtex was found during the operation.

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Libya, which had provided the IRA with tonnes of weapons, including the military explosive Semtex, also withdrew its support.

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It is, as I said on Newsnight last night, like pass the parcel with a stick of financial Semtex: Greece as the detonator, Italy as the explosive mass.

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However, if you read de Chastelain's words across into the IRA's armoury, it is probably safe to assume that he was talking about mortars, rockets, machine guns, rifles and Semtex.

BBC: NEWS | UK | Northern Ireland | Analysis: Why deal stalled