Carlos Castaño and the Prior Assurances of the Mapiripán Massacre

By Harlan Pryce · September 17, 2026

The 1997 slaughter of civilians was facilitated by a military that looked the other way—a partnership the CIA tracked in a report kept secret for decades.

The cost of a quiet airport in the Meta Department was a heap of civilian corpses. In July 1997, the town of Mapiripán, a river outpost in the Colombian jungle, became a killing field where the line between the national army and the death squads vanished entirely.

I am working from the archive's curated description of the record rather than the original pages, but the summary is enough to lay bare the mechanics of the betrayal. The record is a December 1997 intelligence report from the CIA, a Secret-level update on the symbiotic relationship between the Colombian military and the right-wing paramilitaries. It describes a world where the state did not just fail to protect its citizens, but actively cleared the path for their execution.

The Flight into Mapiripán

Violence on this scale requires logistics. Carlos Castaño, the founder of the Peasant Self-Defense Forces of Córdoba and Urabá (ACCU) and the chief of the AUC—the United Self-Defense Forces of Colombia, a paramilitary and drug organization—did not simply wander into Mapiripán. He flew in. He transported troops and weaponry into a civilian airport, an act of brazen audacity that would be impossible in any functioning state unless the state wanted it to happen.

The record is blunt about the arrangement. One intelligence source stated that Castaño "would not have flown forces and weapons into a civilian airport known to have a large police presence if he had not received prior assurances that they would be allowed to pass through."

This is where the public record and the record's specific intelligence converge to reveal a calculated clearance. The police were not asleep; they were standing guard for the killers. The AUC did not breach the airport's security; they were the guests of honor. The "prior assurances" mentioned in the report are the smoking gun of the Mapiripán massacre. The desk's reading is that these assurances were not vague nods or tacit understandings, but specific, documented orders issued from the high command to ensure the police remained stationary while Castaño unloaded his death squads.

Document imagery from nsarchive.gwu.edu From the files: nsarchive.gwu.edu

The Generals of Apathy

Operational freedom for a warlord like Castaño is only possible when the men at the top find the warlord's work useful. The CIA report identifies the two men holding the keys to the Colombian National Army: General Manuel Bonett and General Harold Bedoya.

Manuel Bonett, the Commander of the National Army between 1996 and 1997, was a man of contradictions—a distinguished philosopher and professor of political science at Del Rosario University who oversaw the army during the Toma de Miraflores. Harold Bedoya, a former army chief and future presidential candidate, shared the same strategic vision. According to the record, both men showed "little inclination to combat paramilitary groups."

This "lack of inclination" is a polite intelligence phrasing for a deliberate policy of non-interference. The connection here is a simple, brutal trade. Bonett and Bedoya did not see the AUC as a criminal enterprise to be dismantled, but as a force multiplier. By allowing Castaño to operate, the military could outsource the most stomach-churning work of counter-insurgency—the massacres, the torture, the scorched-earth tactics—to the paramilitaries, keeping the official army ledger relatively clean while the guerrillas were neutralized.

The record notes that the "tacit acceptance of paramilitary operations by some officers 'are longstanding and will not be easily reversed.'" This is the language of a failed state, or rather, a state that has decided its official laws are an obstacle to its unofficial goals.

The Agency's Ledger

While the Colombian generals were ignoring the blood in the streets, the CIA was meticulously recording the degradation. The report characterizes the paramilitary expansion into guerrilla-controlled territory as "the most significant change we have seen in recent months," noting that it "further degraded Colombia's already poor security and human rights situation."

There is a profound irony in the timing and tone of this report. The agency was monitoring the collapse of human rights in real-time, yet the report's conclusion is one of defeatism. It states that "prospects for a concerted effort by the military high command to crack down on paramilitaries—and the officers that cooperate with them—appear dim."

If this file is shaped the way it looks, the report functions as a "Cover Your Ass" memorandum. By documenting the "dim" prospects and the military's failures, the agency created a paper trail of internal warnings. This allowed the United States to maintain a posture of concern regarding human rights while continuing the operational and financial support that kept the Colombian military afloat. The agency was not writing a warning to be acted upon; it was writing a defense to be filed away in case the Mapiripán massacre ever became a diplomatic liability.

The Missing Pipeline

What the record does not say is more important than what it does. There is a gaping void in the analysis regarding the money. The AUC did not possess a private air force and a global logistics network by accident. The movement of troops and heavy weaponry into civilian airports requires a financial and logistical pipeline that the record ignores.

The pattern suggests a direct financial link between the AUC and the Colombian military high command, one that the CIA knew about but chose to omit from this specific intelligence update. A paramilitary organization does not simply "expand" into guerrilla territory without the logistical support of the state's intelligence and transport assets. The gap between the military's stated "lack of inclination to combat" and the AUC's high-cost aerial capabilities is the space where the real story lives.

Furthermore, the record mentions "the officers that cooperate with them" immediately after naming Bonett and Bedoya. The desk's reading is that the withheld pages of this eight-page report contain a specific roster—a hit list of mid-level officers who were on Castaño's payroll or acting as his handlers. The CIA kept the generals' names in the report to establish the general climate of failure, but they buried the specific names of the cooperating officers to protect the intelligence assets they were likely using to track the AUC.

Ultimately, the record reveals a strategic trade-off that the U.S. government tolerated for years. The AUC's efficacy in neutralizing left-wing guerrilla forces was weighed against the slaughter of civilians in places like Mapiripán, and the AUC was found to be the more valuable asset. The "dim" prospects for change were not a result of the military's incompetence, but of their success in a war where the rules of engagement were discarded in favor of results.

The Mapiripán massacre was not a failure of the Colombian state; it was a successful operation of a state-sponsored shadow army. Those who paid for it were the peasants of the Meta Department, and those who protected the secret were the men in Bogotá and Langley who decided that a few hundred dead civilians were a fair price for a quieter jungle.

Carlos Castaño and the Prior Assurances of the Mapiripán Massacre

The Flight into Mapiripán

The Generals of Apathy

The Agency's Ledger

The Missing Pipeline

Sources