The United States is operating floating prisons" to house those arrested in its war on terror, according to human rights lawyers, who claim there has been an attempt to conceal the numbers and whereabouts of detainees. Details of ships where detainees have been held and sites allegedly being used in countries across the world have been compiled as the debate over detention without trial intensifies on both sides of the Atlantic. Information about the operation of prison ships has emerged through a number of sources, including statements from the US military, the Council of Europe and related parliamentary bodies, and the testimonies of prisoners. The analysis, due to be published this year by the human rights organisation Reprieve, also claims there have been more than 200 new cases of rendition since 2006, when President George Bush declared that the practice had stopped. According to research carried out by Reprieve, the US may have used as many as 17 ships as "floating prisons" since 2001. Detainees are interrogated aboard the vessels and then rendered to other, often undisclosed, locations. Ships that are understood to have held prisoners include the USS Bataan and USS Peleliu. A further 15 ships are suspected of having operated around the British territory of Diego Garcia in the Indian Ocean, which has been used as a military base by the UK and the Americans. Clive Stafford Smith, Reprieve's legal director, said: "They choose ships to try to keep their misconduct as far as possible from the prying eyes of the media and lawyers. We will eventually reunite these ghost prisoners with their legal rights."