** FILE ** Marc Gonsalves sits in an undisclosed location in southern Colombia, guarded by rebels of the Revolutionary Armed Forces of Colombia (FARC), in this July 25, 2003, file photo. Gonsalves is one of three Northrop Grumman Corp. contractors held hostage by FARC, since their plane crashed in the southern Colombian jungle Feb. 13, 2003, near the rebel strongheld. "I'm deeply concerned about their fate," President Bush said in an interview with RCN TV of Colombia on Wednesday, March 7, 2007, on the eve of departing on a five-nation trip to Latin America. Bush heads to Bogota, Colombia's capital, on March 11. (AP Photo/Jorge Enrique Botero, File)