Northern Ireland police released Gerry Adams from custody on Sunday amid fears that his four-day detention could destabilise the British province. He was arrested over the 1972 murder of Jean McConville, a killing he repeatedly denies. His detention raised tensions among Northern Ireland's power-sharing government and its fragile peace after Sinn Fein pointed the finger at ‘dark forces’ in the police service and their Protestant partners in government. A calm Adams toned down the rhetoric and said he supported the police. Tapes being held at Boston College, USA, are a key part of the investigation. The tapes contain a testimony of a former IRA commander stating Gerry Adams was overall commander of the IRA's Belfast brigade, controlling his own squad - ‘the unknowns’ who were responsible for the 'Disappeared'. See also: http://www.bbc.co.uk/news/uk-northern-ireland-27238797