A delegation from the International Criminal Court has visited colleagues detained by a local militia in the Libyan mountain town of Zintan, says a senior official.
The Hague-based court, the Australian government and rights groups have all demanded their immediate release. The ICC said their detention is illegal as they are immune from prosecution.
However, Tripoli says the accused has put national security in jeopardy and will be held for 45 days while they are investigated.
The Zintan militia captured Saif al-Islam last November and has since refused to hand him over to central authorities in Tripoli.
Australian lawyer Melinda Taylor was detained last week, after being accused of clandestinely passed Gaddafi a coded letter from a fugitive former aide, Mohammed Ismail. Meanwhile her Lebanese translator Helene Assaf is accused of being her accomplice.
Two others - Russian Alexander Khodakov and Spaniard Esteban Peralta Losilla - are with them, but it is unclear whether they are staying out of solidarity for their colleagues or are being held against their will.
"I can confirm that the ICC delegation entered Zintan and visited their colleagues," despite initially being halted at the entrance to the town by militia members, Mr Jehani was quoted as saying.
"They are well in a guesthouse, not in a prison. They have food, water, and are being treated well," Mr Jehani reportedly said.
That was confirmed by Australian Foreign Minister Bob Carr, who said the Australian envoy had told him the detainees were "under no duress, they are enjoying air conditioning and television and fridges with fruit and yoghurt," reported Radio Australia.
But he added: "The sad point is that there is no immediate prospect of release."