US and UK spy agencies built close ties with their Libyan counterparts during the so-called War on Terror, according to documents discovered at the office of Col Gaddafi's former spy chief.

The papers suggest the CIA abducted several suspected militants from 2002 to 2004 and handed them to Tripoli.

The UK's MI6 also apparently gave the Gaddafi regime details of dissidents.

The documents, found by Human Rights Watch workers, have not been seen by the BBC or independently verified.

Meanwhile, the head of Libya's interim governing body, the National Transitional Council, said its soldiers were laying siege to towns still held by Col Gaddafi's forces.

Mustafa Abdel Jalil said Sirte, Bani Walid, Jufra and Sabha were being given humanitarian aid, but had one week to surrender.

The BBC's Jon Leyne in Benghazi says there have been unconfirmed reports that Bani Walid has now been taken by anti-Gaddafi forces.

But witnesses on the edge of Bani Walid say the opposition fighters are still on the outskirts although our correspondent adds that it appears as if Gaddafi loyalists have abandoned many of their outlying positions.

'Protecting Americans'

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