A report by the United Nations nuclear watchdog has praised Libya for its co-operation in revealing details of its dismantled atomic weapons programme.
But the International Atomic Energy Agency (IAEA) said questions remained over what Tripoli did with weapons design information it possessed.
Documents relating to the design of an atomic weapon were obtained by the country from the nuclear black market.
Libya announced it was abandoning plans to develop nuclear weapons last year.
The IAEA report says Libya's declarations about many of its past nuclear activities appear consistent with information verified by the agency.
But it adds that the weapon design documents are undergoing forensic analysis to work out the dates of printing and the source of the paper.
A spokesman for the IAEA, Mark Gwozdecki, told the BBC that the agency needed additional information from the providers in the nuclear black market before it could make a credible assessment on what Libya did with the design information.
The agency has also called on all member states to continue co-operating with the UN's probe of the nuclear black market.
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