Police in Northern Ireland questioned Sinn Fein leader Gerry Adams on Thursday (May 1) after arresting him under an investigation into one of the province's most notorious murders, a move that stirred fierce political reaction in Britain and Ireland.

In his book "Voices from the Grave", Boston College researcher Ed Moloney quoted Hughes as saying that McConville was killed by a squad "established by and ultimately ... responsible to Gerry Adams," a charge Adams has always vigorously denied.