Colombia ? Three kidnapped U.S. defense contractors and dozens of other hostages held by Colombian guerrillas must be swapped for all the guerrillas held in U.S. and Colombian jails, a senior rebel said on Saturday.

Rodrigo Granda, the so called “foreign minister” of the Revolutionary Armed Forces of Colombia, or FARC, said the rebels will not consider piecemeal negotiations or prisoner swaps for the hostages, including the Americans and former presidential candidate Ingrid Betancourt.

“If the (Americans) want an agreement, then they must send back those rebels in prison in the U.S.,” Granda said in an interview with The Associated Press. “I understand the U.S. government did similar swaps in return for captured Americans during the Cold War, so I don’t see why they can’t do it in this case.”

U.S. contractors Marc Gonsalves, Keith Stansell and Thomas Howes were kidnapped in 2003 when their plane went down in southern Colombia as they were carrying out an intelligence gathering mission. The FARC call them prisoners of war and accuses them of spying for the CIA.