Lorenzo Betancourt (R), the son of kidnapped former of kidnapped Colombian politician Ingrid Betancourt and French journalist Florence Aubenas (L), leads a march for the release of Ingrid Betancourt, in Paris April 6, 2008. Betancourt, a dual French-Colombian citizen captured six years ago, and three U.S. contractors are among the high-profile hostages held in secret jungle camps by the Revolutionary Armed Forces of Colombia, or FARC, guerrillas. REUTERS/Benoit Tessier (FRANCE)