The prime minister of Libya has pledged a fair trial for Muammar Gaddafi's son Saif al-Islam after his capture while trying to flee to Niger, BBC reported.

Abdurrahim al-Keib gave the assurance after visiting the northern town of Zintan, where he was being held after being detained in the desert.

He said he trusted militia in the town to take care of him.

Libyan prosecutors are due to begin his interrogation later on Sunday, a senior justice official told the BBC.

The official, Abdel Basset Zueraik, said that, according to Libyan law, questioning must begin within 48 hours of arrest. He would not confirm where the prisoner was being held but it could be either Zintan or Misrata.

Concerns have been raised about the possibility of ill-treatment, after Gaddafi himself was killed in custody.

Saif al-Islam, the last key Gaddafi family member to be seized or killed, is wanted by the International Criminal Court (ICC) on charges of crimes against humanity.

ICC prosecutor Luis Moreno Ocampo plans to visit Libya next week for talks with the interim National Transitional Council (NTC) on where the trial will take place.

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