A bomb attack attributed to fighters from the EMC armed group killed 20 travelers trapped on the busy highway connecting Colombia’s southwestern cities on Saturday.

The tragic events in the El Tunel sector, close to the town of Cajibío, unfolded after the dissidents mounted a checkpoint on the main Via Panamericana south of Cali and 30 kilometers (20 miles) before Popayán.

The busy road runs through a mountainous region dominated by gangs run by the former guerrillas dedicated to a booming cocaine industry in hidden canyons beyond state control. At the illegal checkpoint the fighters forced truck drivers to block the road and abandon their vehicles, causing a long queue of traffic.

According to video posted online, soon after a midday the huge explosion rocked the valley mangling around 15 vehicles caught blockade including two minibuses with civilian passengers.

The governor of Cauca, Octavio Guzmán, confirmed the 20 dead civilians caught in the blast were 15 women and five men, all adults. A further 47 people were injured, of whom three were critical. Five children were recovering in hospital. Eleven of the affected persons came from the same village of Pedregosa, close to Cajibío, he added.

“What happened on April 25th constitutes the most brutal and ruthless attack against the civilian population in decades in the department of Cauca,” the governor later announced.

The bomb had displaced 200 cubic meters of soil, he said, creating a crater five meters deep in the Panamericana highway, the main route linking Cali to Popayan and on to Ecuador. Despite the damage, road crews were able to partially reopen the road six hours after the blast.

Saturday’s attack, one of the worst atrocities in recent years, comes against a background of rising conflict between state forces and dissident armed groups in the southwest of Colombia.

#ULTIMAHORA

A nuestro medio de comunicación llega video #PRIMICIA del momento exacto donde explota el artefacto explosivo en el sector conocido como el TÚNEL CAJIBIO CAUCA entre popayan y piendamo @Noti90Minutos @DELAESPRIELLAE

Noticia en desarrollo pic.twitter.com/g4KEcSroYd

— SARCASTICO DE DERECHA (@esco27438) April 25, 2026

Terrorist tactics

Just in the last four days communities across three departments – Valle, Cauca and Nariño – reported a series of what appear to be coordinated attacks against civilian and military targets. These included:

• 24 April – A bus bomb exploded close to base of the Pichincha Battalion in the south of Cali, causing damage and three injuries.
• 24 April – In the nearby town of Palmira, Valle, an army base came under attack from cylinder bombs launched from a passing vehicle, no injuries were reported.
• 25 April – Two attackers launched grenades at a petrol station in Rozo, Valle, damaging vehicles.
• 25 April – A police station in the rural community of Potrerito, close to Jamundí, came under gunfire attack in the early hours of the morning.
• 25 April – In another morning attack, Aeronáutica Civil reported drones launching explosives against a hilltop air traffic station close to El Tambo (Cauca), damaging antennas and leaving the radar inoperative.
• 25 April – a chiva rural bus was hit by explosive charges while traveling on Route 25 near to Mercaderes, south of Popayan. Police reported several injured including a child but no deaths
• 26 April – four men were gunned down in a bar in Toro, Valle, between Cali and Pereira.

According to a tally by thinktank Indepaz, the Toro deaths were the 48^th massacre recorded in 2026. In Colombia a ‘massacre’ is defined by the intentional killing of three or more people at the same time.

This weekend’s attacks were typical of a return to terrorist tactics such as car bombs, motorbike bombs, drones dropping home-made explosives and other artisanal artefacts.

Saturday’s Cajibío attack was initially reported as a boobytrap bomb, or “IED” (Improvised Explosive Device) which are caches of high explosives buried by the roadside by rebel groups, usually aimed at passing military patrols

But later reports suggested the civilian vehicles were struck by a pipeta mortar. These are fashioned from household gas bottles and clumsily launched from mortars made of industrial piping.

Notoriously inaccurate, a pipetas have claimed many civilian lives in the Colombian conflict, most notably in the Chocó town of Bojayá in 2002 when a charge launched by FARC guerrillas struck a church killing 79 civilians sheltering inside.

Behind Saturday’s atrocity was alias ‘Marlon’ of the Estado Mayor Central (EMC), said Colombia’s defence minister of defence Pedro Sanchez. The state offered a reward of US$140,000 for information leading to his capture.

Original dissidents

Marlon, whose real name is Iván Idrobo, was formerly in the ranks of the FARC guerrillas where he trained as a bomb maker. He is now thought to lead the EMC’s Frente Jaime Martínez which according to the Defensoria del Pueblo controls the cocaine trade, illegal gold mining and extortion rackets around the town of Suárez in the northwest of Cauca.

The EMC, lead by former FARC chief Iván Mordico, has proven to be the most intransigent of the myriad of armed groups which the current Petro government has tried to broker peace with under his controversial Paz Total policy.

See also: Peace Plan has Caused more Conflict, says Thinktank

Seen as the “original” dissidents that rejected the partly successful peace process under former president Manual Santos in 2016, the EMC initially agreed to negotiate when Gustavo Petro came to power in 2022 but soon engaged in bitter infighting with rival armed groups creating a rupture with Paz Total.

For his part, Petro tweeted his disgust at the Cajibío attack and the EMC “narco-terrorists” behind it.

“The groups led by Iván Mordisco in Cauca are criminals who have committed crimes against humanity and must be treated as such,” he said.

Some pundits commented that Petro’s early treatment of the EMC as a political actor had given the armed group room to expand, contributing to the current security crisis. In the heat of next month’s elections, others turned their ire on presidential candidate Iván Cepeda, seen as an architect of Petro’s struggling peace plans.

Rival right-wing candidate Paloma Valencia accused Cepeda of his role in “tying the hands of state forces, the rampant increase in illicit crops, the historic numbers of massacres, and waves of violence like today’s”.

Valencia also rounded on Petro for posting photos of his birthday celebrations even as the country was reeling from the horrific footage of the Cauca bombing. “Show some respect,” she messaged.

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Crucial Santa Marta conference will include voices of communities long opposed to the exploitation of fossil fuels.

Thirty years ago, Colombia’s U’wa people were ready to commit mass suicide by jumping off a 500-meter cliff. The close-knit indigenous community would rather die with dignity than succumb to oil exploration on their ancestral land.

The U’wa announced their dilemma in 1995 in an open letter that ricocheted around the world. It was no empty threat: 400 years before their ancestors had jumped from the Alto de los Infieles (Cliff of the Infidels) rather than submit to the Spanish colonial yoke.

“The U’wa were the first to call oil the ‘blood of the earth’,” explains Kevin Koenig, director of climate and energy at Amazon Watch, a U.S.-based non-profit. “The U’wa were the first to say that oil needs to stay in the ground. They warned against its extraction and its impact on the world.”

Amazon Watch has supported the U’wa to resist extractive industries over the same three decades, along with dozens of other at-risk communities in Latin America.

This week, in a ground-breaking conference in Santa Marta, some of those efforts will come full circle at the first global summit on “Transitioning away from Fossil Fuels”.

The six-day conference, starting April 24, will host 50 country delegations plus dozens of civil society organizations.

This “road map towards renewable energy” is backed by the Fossil Fuel Treaty Initiative, an alliance of nation states, technical bodies, communities and individuals working to secure a “global just transition from coal, oil and gas”.

For the organizers the timing is critical with climate upset, fuel shortages, war in the Middle East and big oil’s sticky grip on geopolitics more exposed than ever. There’s never been a better moment to move to renewable energy.

A key part of the conference will be representation from indigenous communities; the U’wa, along with many others, will have a voice at the table.

Glacier gone

For Koenig, it is also significant that the inaugural meeting is in Colombia, one of the world’s most biodiverse countries, but also an oil producer moving to curb fossil fuels and embrace renewables.

There is further symmetry in the location: the small coastal city of Santa Marta is “just over the hill” from the U’wa territory which straddles the tropical glaciers of the El Cocuy mountain range, Koenig tells The Bogotá Post.

A hiking route over the same mountains is known as Colombia’s climate change trail – see the ice before it melts.

Prophetically, just three weeks before the conference’s kick-off, the IDEAM climate agency reported that a glacier in the heart of U’wa territory had melted for good.

“Satellite monitoring confirms that Los Cerros de la Plaza glacier coverage is today at zero square kilometers,” it announced matter-of-factly.

Living these realities gives indigenous communities such as the U’wa, wedded to nature and geography, a powerful voice in the transition from fossil fuels.

This experience has often come at a high cost, says Koenig. In countries like Colombia, particularly in the Amazon, oil companies are an existential threat to both the natural environment and the communities it supports. Drilling is invariably a catalyst for violence.

“Some countries use oil extraction as a reason to open areas, saying ‘we can militarize it and it will be safer’. In fact, oil and energy infrastructures are a magnet for armed groups, for political attacks or blackmail,” he explains.

Amazon Watch has supported many indigenous communities to resist oil companies in the Amazon regions of southern Colombia, Peru and Ecuador, often through practical means such as providing solar power and communications equipment, trainings and legal resources, but also by raising their voices to the outside world.

The organization’s latest report, The Amazon Under Siege, highlights how extractive industries and the armed groups that trail in their wake are putting Amazon communities in the crossfire.

Oil addiction

Colombia might have turned a corner with its oil moratorium in Amazon regions but neighboring countries are on a different path, one that might be summed up by U.S. president Donald Trump’s call to “drill, baby, drill”.

“Ecuador is going in the opposite direction with new oil auctions, and two new exploration blocks in remote rainforest,” says Koenig. Peru is following suit in jungle areas hitherto untouched. Perhaps not surprisingly, neither of the Andean countries is attending the Santa Marta transition conference.

According to Koenig, Peru and Ecuador are already in the throes of social violence but now risk replicating Colombia’s conflict with its rural oil pipelines that are constantly attacked or bombed, or oil lines tapped by fuel thieves, creating spills in biodiverse hotspots.

Added to that, drilling new wells makes little economic sense, he says. Current markets are signalling peak oil demand by 2030 even while wind and solar are taking a bigger share of energy output.

By doubling down on oil extraction both countries are “gambling with their future.” Aside from the moral and ethical issues of drilling in remote rainforest with indigenous peoples, getting banks to fund these ventures against the headwinds of renewables is not guaranteed.

“This is the moment where we are seeing both wars linked to fossil fuels politics and dependencies, but also for the first time renewables energies are not just theoretical, they are real, and decision-makers know they are scalable,” notes Koenig.

Fresh air

This seismic shift is reflected in the sassy subtext of the Santa Marta conference: climate deniers not invited. Meetings are reserved for a “coalition of the willing”, Colombian environment minister Irene Vélez, a key organizer of the event, told the Guardian this week..

For campaigners like Kevin Koenig this attitude is a breath of fresh air. Previous climate change conferences, run by the UN, have failed to pin global warming on big oil, he says.

“We know that fossil fuels are the number one source of carbon emissions but that’s nowhere to be found in the Paris [climate change] agreement. That’s due largely to the influence of the oil industry and lobbyists,” says Koenig.

Changing the narrative requires an alignment between traditional knowledge and science, he says. Indigenous communities, the original resisters, are now part of that with their wealth of experience.

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