HAVANA The Rev. Jesse Jackson accepted an invitation Saturday from Colombia's largest guerrilla army to mediate the release of a U.S. man the rebels have held since June.
The U.S. civil rights activist announced his intervention inafter meeting late into the previous night with leaders of the Revolutionary Armed Forces of Colombia, or FARC.
FARC and Colombian government negotiators have been holding peace talks in Havana since November 2012.
"We accept this obligation and opportunity to render service to Kevin Scott, his family and our nation," Jackson told reporters outside Havana's Hotel Nacional.
"We have made contact with the (U.S.) State Department urging them to contact the next of kin of Kevin Scott and let them know his release is imminent," added Jackson, who plans to travel to Colombia next week.
Scott was detained by the rebels in June while walking through the jungle southeast of the Colombian capital, Bogota. According to the FARC, he was wearing military fatigues and carrying surveillance equipment.
Earlier Saturday the FARC issued a statement asking Jackson "to make available his experience and integrity to expedite Kevin Scott's release." It said it intends to free him unilaterally.
Jackson has travelled to Yugoslavia, Syria and Iraq to help secure the release of detained American citizens.
He has visited Cuba on numerous occasions and met with both Fidel and Raul Castro. In 1984 he assisted in the release of 26 Cuban prisoners.
Jackson said Friday upon arrival in Havana that he hopes to meet with American government subcontractorafter he was caught importing restricted communications equipment into the country.
Asked again about the case on Saturday, Jackson said: "There are associates that we have within the Cuban government that have great concern about Alan Gross. We are not working on that assignment today, but we are very concerned."
Gross, 64, was arrested in Cuba while working on a democracy-building project financed by the U.S. Agency for International Development.
Havana considers such programs a violation of its sovereignty, and Gross was convicted under a statute governing crimes against the state.
Gross, who has said he was setting up Internet for Cuba's small Jewish community, denies any intention to harm the country.