McConville murder: Brendan Hughes' taped accusation
1 May 2014 Last updated at 12:02 BST
Sinn Féin leader Gerry Adams is being questioned by Northern Ireland police in connection with the 1972 murder of Jean McConville.
The 37-year-old widow and mother-of-10 was abducted and shot by the IRA. Her body was recovered from a beach in County Louth in 2003.
Mrs McConville, one of Northern Ireland's Disappeared, was kidnapped in front of her children after being wrongly accused of being an informer.
Last month, Ivor Bell, 77, a leader in the Provisional IRA in the 1970s, was charged with aiding and abetting the murder.
The case against Bell is based on an interview he allegedly gave to researchers at Boston College in the US.
The Boston College tapes are a series of candid, confessional interviews with former loyalist and republican paramilitaries, designed to be an oral history of the Troubles.
Another former IRA member Brendan Hughes, who fell out with Gerry Adams, also spoke to the college, before his death in 2008.
In the interviews he alleged Mr Adams was responsible for Mrs McConville's death. The Sinn Féin leader says this is a lie.
These interviews were first broadcast as part of the programme The Disappeared in November 2013.