He was taken by fighters near the southern town of Obari and flown to the city of Zintan in the north. Saif al-Islam told a journalist he was well.

He is the last key Gaddafi family member to be seized or killed. Libya's new prime minister says he will get a fair trial in Libya.

Saif al-Islam, 39, is wanted by the International Criminal Court (ICC) for alleged crimes against humanity.

A militia force allied to the ruling National Transitional Council (NTC) said he had been captured in the desert about 50km (30 miles) west of Obari, and taken to their base in Zintan in the north.