A detective heading the Claudy bombing investigation has travelled to the US to question a suspect detained by the FBI.
The confirmation came as the PSNI failed in an unprecedented legal bid to be allowed to view a BBC television documentary into events surrounding the blasts before it was broadcast last night.
Nine people were killed in bomb attacks on the Co Derry village of Claudy in July 1972.
Earlier this year, a Northern Ireland Police Ombudsman report found senior RUC officers conspired with the British government to protect a Catholic priest suspected over the attack.
The alleged collusion was to move Fr James Chesney, who died in 1980, to a parish in the Republic.
