Now if the militia could only find someone to hand him over to.
Saif al-Islam and three armed companions were taken without a fight overnight, officials said, and he was not injured -- unlike his father, who was killed a month ago on Sunday after being captured in his home town.
"We have arrested Saif al-Islam Gaddafi in (the) Obari area," Justice Minister Mohammed al-Alagy told Reuters, adding that the younger Gaddafi, wanted for crimes against humanity by the International Criminal Court at The Hague, was not injured.
A photograph of Saif al-Islam showed him lying on what appeared to be a reclining sofa with his fingers wrapped in bandages and his legs covered with a thick, brown blanket. The wounds were apparently sustained earlier.
The Zintan fighters, who make up one of the powerful militia factions holding ultimate power in a country still without a government, said they planned to keep him in Zintan, until they could hand him over to the authorities.
Prime minister-designate Abdurrahim El-Keib is scheduled to form a government by Tuesday, and the fate of Saif al-Islam, whom Libyans want to try at home before, possibly, handing him over to The ICC, will be an early test of its authority.
Don't bet on an early handover. The Zintans know how valuable their prisoner is and will no doubt want to "negotiate" - or entertain bribe offers - for turning him over.