BOGOTA, Colombia — A top rebel leader was killed by his own chief of security, who gave Colombian troops the leader's severed hand as proof, the defense minister said Friday.
Ivan Rios was the second top rebel killed in a week, a major setback for the Revolutionary Armed Forces of Colombia (FARC), the country's largest rebel force.
No top Colombian rebel leader had ever been slain until Raul Reyes was killed March 1 in a cross-border raid by Colombian troops into Ecuador that set off an international diplomatic crisis.
"The FARC has suffered a new, major blow," Defense Minister Juan Manuel Santos told reporters, calling Rios' death "yet another demonstration that the FARC is falling apart."
He said troops launched an operation designed to capture Rios on Feb. 17 after receiving tips that he was in a mountainous area straddling the western Colombian provinces of Caldas and Antioquia, and engaged the guerrillas' outer security ring seven times.
Thursday night, he said, a guerrilla known as Rojas came to the troops with Rios' severed right hand, laptop computer and ID, saying he had killed his boss three days earlier.
It was unclear what motivated the killing, but Santos said it was to "relieve the military pressure" because the rebels were "surrounded, without supplies and without communication."
The U.S. State Department has a bounty of $5 million for Rios' capture.
Santos said Colombia waited to make the announcement until it had confirmed Rios' identity, which it did Friday.
He did not say what happened to Rojas, nor whether authorities had recovered the rest of Rios' body. He did not take questions.
Rios, whose real name has been given as Jose Juvenal Velandia and Manuel Jesus Munoz, faced U.S. federal charges of drug smuggling, and was on a U.S. Treasury Department list of terrorists and drug traffickers.
The 46-year-old Rios became known across Colombia as one of the rebels' main negotiators in failed peace talks that ended in 2002. Unlike the FARC's mostly peasant leadership, he was a former university student who engaged journalists and foreign envoys in political and economic discussions.
"He was the youngest member of the secretariat. He was very important to the rebels," said Alfredo Rangel of the Bogota-based think tank Security and Democracy. "This shows the army is capable of taking down the rebels' most important pillars and that any of the leaders can fall at any time."
In a 1999 interview with The Associated Press, Rios said he joined the insurgency as a student in Medellin to avoid being killed by right-wing death squads that had attacked other student activists.
He commanded the FARC's central bloc, which operates throughout Colombia's northwestern coffee region. Security forces say he frequently accompanied the FARC's senior leader, Manuel "Sureshot" Marulanda, in recent years.