The captives were named as Philippe Verdon and Serge Lazarevic, in documents seen by AFP.
One of the conditions was that he would provide proof of life of the captives.
These were the first pictures since 2003 that provided evidence that the captives might be alive.
Family members have also expressed concern that a military operation would endanger the lives of the captives.
Italian Premier Bettino Craxi ordered the captives to be released, although Italy later charged Abbas and his co-conspirators.
Little is known about the captives because of a media blackout during a large period of their captivity.
Song also said none of the captives were suffering from critical health problems.
Across the world, from a hiding place in Holland to prison camps of Lausanne, the captives awaited their liberators.
Authorities say the captives are still in the area where they were abducted.
Tribal elders who saw the captives said that they were being fed and looked after, local officials told the BBC.
But earlier this month, the father of one of the captives accused the government of not keeping the families fully informed.
Five of the captives had been held by the rebels for more than a year, while three others were kidnapped in September.
After creating a two-week international spectacle and crisis, Iran released the captives.
The French gas group GDF Suez identified the captives as an employee working in the Cameroon capital of Yaounde and his family.
The psychological health of the captives is a cause for concern.
On Saturday, Algerian forces launched a raid to retake the facility after reports that the militants had killed a number of the captives and were planning to blow up the gas plant.
Just last month, it was inspiring to see thousands of young Christians filling the Georgia Dome at the Passion Conference, to worship the God who sets the captives free and work to end modern slavery.
WHITEHOUSE: Remarks by the President at the National Prayer Breakfast
Farc's decision to quickly free the captives suggests the rebels are no longer willing to pay the political price for capturing and holding members of the Colombian security forces for too long, says the BBC's correspondent in Bogota, Arturo Wallace.
Four of the captives - Britons Margaret Whitehouse, 52, a teacher from Hampshire, Ruth Williamson, 34, an NHS employee from Edinburgh, university lecturer Peter Rowe, 60, from Durham, and Australian Andrew Thirsk - were killed after Yemeni authorities tried to rescue them.
The Iranian government denied rebel claims that the 48 captives were members of Iran's Revolutionary Guard.
Iranian media initially reported that the 48 captives were pilgrims on a visit.
Some people in the neighborhood, including Charles Ramsey, the man who helped free the alleged captives, say they don't recall seeing anything suspicious at Castro's home.
At noon local time on Thursday, Algerian forces attacked as the militants tried to move some of their captives from the facility.
All of this adds to the endless charm of their scampering and marching and delicately calibrated choreography, which threads the young dancers through the production as lively captives and, eventually, as members of the narrative's intricate and marvelously arranged climax.
After two years, Basket and the other surviving captives were repatriated.
The Algerian armed forces attacked on Thursday as militants tried to move some of their captives from the facility.
Algerian special forces stormed the plant on Saturday to end the four-day siege, moving in to thwart what government officials said was a plot by the Islamic extremists to blow up the complex and kill all their captives with mines sown throughout the site.
The Algerian armed forces staged an initial attack on Thursday as militants tried to move some of their captives from the facility.
The internal security minister, George Saitoti, had complained several times that, without more support, Kenya's justice system could not cope with the influx of pirate captives.
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