U.S. said to hold inmates on warships

The United Nations says it has learned of serious allegations that the US is secretly detaining terrorism suspects, notably on American military ships.
The special rapporteur on torture, Manfred Nowak, said the claims were rumours at this stage, but urged the US to co-operate with an investigation.
He said the UN wants lists of the places of detention and those held.
The comments come five days after the UN accused the US of stalling on their requests to visit Guantanamo Bay.