Humberto de la Calle, head of Colombia's peace negotiation team, speaks to journalists before embarking to Havana for a round of talks with rebels of the Revolutionary Armed Forces of Colombia, FARC, at the military airport in Bogota, Colombia, Sunday, Nov. 18, 2012. (AP Photo/William Fernando Martinez)
Humberto de la Calle, head of Colombia's peace negotiation team, speaks to journalists before embarking to Havana for a round of talks with rebels of the Revolutionary Armed Forces of Colombia, FARC, at the military airport in Bogota, Colombia, Sunday, Nov. 18, 2012. (AP Photo/William Fernando Martinez)
** FILE ** Jailed rebel Ricardo Palmera, alias Simon Trinidad, can be seen at the U.S. federal penitentiary in Florence, Colo., in this Aug. 8, 2012, photo provided by Jaime Palmera. Palmera's journey from the Colombia's highest social circles to jungle battlegrounds and finally to a U.S. prison mirrors the complexity of the confrontation that the talks starting this week in Cuba are meant to end. The Revolutionary Armed Forces of Colombia, or FARC, considers him a prisoner of war. (AP Photo/Courtesy of Jaime Palmera)
** FILE ** Jailed rebel Ricardo Palmera, alias Simon Trinidad, can be seen at the U.S. federal penitentiary in Florence, Colo., in this Aug. 8, 2012, photo provided by Jaime Palmera. Palmera's journey from the Colombia's highest social circles to jungle battlegrounds and finally to a U.S. prison mirrors the complexity of the confrontation that the talks starting this week in Cuba are meant to end. The Revolutionary Armed Forces of Colombia, or FARC, considers him a prisoner of war. (AP Photo/Courtesy of Jaime Palmera)
A relative embraces former hostage Jorge Romero at police headquarters in Bogota on April 4. Even if the FARC releases all its captives, many obstacles remain for talks aimed at ending a half-century of conflict in Colombia. (Associated Press)
Former hostages Cesar Augusto Lasso (from left), Jose Forero, Jorge Romero, Carlos Duarte and Wilson Rojas greet each other at police headquarters in Bogota, Colombia, on April 4. The men had spent between 12 and 14 years in jungle prisons. They were captured when the Revolutionary Armed Forces of Colombia was at the height of its military strength. (Associated Press)
Police officers in Bogota, Columbia, on Thursday Feb. 23, 2012, hold photographs of fellow officers who were kidnapped by rebels of the Revolutionary Armed Forces of Colombia (FARC). (AP Photo/Fernando Vergara)
Relatives of slain hostage Elkin Hernandez, at his family home in Bogota, Colombia, Saturday Nov. 26, 2011. Colombia's President Juan Manuel Santos said that rebels of the Revolutionary Armed Forces of Colombia, FARC, killed four members of the security forces, including Hernandez, a police major kidnapped in 1998. All were found killed execution-style Saturday morning in the southern state of Caqueta after been held between 12 and 13 years. (AP Photo/William Fernando Martinez)
FILE - In this April 28, 2000 file photo, Alfonso Cano, a Revolutionary Armed Forces of Colombia (FARC) commander who will head the Boliviarian Movement, a new clandestine political party for the rebels, attends a practice ceremony for the political party opening outside of San Vicente del Caguan in the FARC controlled zone of Colombia. According to Colombian military authorities, Cano, the top FARC commander, was killed in a military operation on Friday Nov. 4, 2011. (AP Photo/Scott Dalton, File)
