In August 1971, internment without trial was introduced in Northern Ireland. Adams was arrested in March 1972 and interned HMS Maidstone, but was set free in June to take part in secret talks in London. There was a short-lived truce and some members of the IRA met with William Whitelaw the British government minister in charge of Northern Ireland. The IRA delegation included Sean Mac Stiofain (Chief of Staff), Daithi O'Conaill, Seamus Twomey, Ivor Bell, Martin McGuinness and Gerry Adams. The IRA insisted Adams be included in the meeting and he was released from internment to participate. Following the failure of the talks, he helped to plan a bombing campaign in Belfast known as Bloody Friday. He was re-arrested in July 1973 and interned at Long Kesh internment camp, which was later called the Maze Prison. After attempting to escape he was sentenced to imprisonment, which was also served at the Maze.