BOGOTA, Colombia (AP) — Four Chinese oil workers have been freed in the same southern jungles where the country's largest rebel group kidnapped them 17 months ago, police said Thursday. China's ambassador said that no ransom was ever sought for the men.

The four Chinese nationals, three contractors and a translator, were the only foreigners known to still be held by the Revolutionary Armed Forces of Colombia, or FARC.

Their release around midnight Wednesday to the International Red Cross comes three days after the FARC and Colombia's government began peace talks in Cuba that were partially conditioned on the rebels halting extortive kidnapping. It led Colombia's defense minister to call them "mendacious and traitorous" Thursday for having claimed in September to no longer hold kidnap victims.

The rebels announced in February that they were halting all kidnapping and they insist they hold no more captives, neither "political prisoners" nor "economic" hostages.

The FARC has been fighting successive Colombian governments for a half century and has used kidnapping for political leverage and as a financing source, at one point holding three U.S. military contractors as well as several dozen prominent Colombian politicians.

Asked whether a ransom was paid for the men's release, Chinese Ambassador Wang Xiaoyuan told reporters in Bogota that "a ransom was not even demanded." He said no one ever claimed responsibility for the kidnapping.

He did not explain how the men's release was accomplished.

Colombian officials said they had no doubt the FARC was behind the kidnapping and said the handover was arranged by the Chinese Embassy and the International Red Cross

State police chief Col. Carlos Vargas said the four were released in good shape in a rural area of San Vicente del Caguan, a FARC bastion.

The country chief of the International Committee of the Red Cross, Jordi Raich, told reporters the four were freed by a small group of unarmed men in civilian clothing. He said the freed oil workers all appeared in good health though one appeared to have difficulty walking and would surely be given a medical checkup.

Images of them taken by a local TV network showed the men, bearded and with long hair, wearing hats in San Vicente early Thursday. One was in a wheelchair

Employed by the British company Emerald Energy, which is part of the China-based Sinochem Group, they were seized June 8, 2011, while engaged in oil exploration work.

The men's driver, who was released with their vehicle, said they were taken by at least seven FARC rebels.

Authorities identified the freed men as Tang Guofu, 28, Zhao Hongwei, 36, Jian Mingfu, 46, and Jiang Shan, 24. They said Jiang was the translator. Continued...