It is not yet clear who was behind the bombing, but armed criminal groups have recently stepped up attacks against the security forces in retaliation

Several buildings were damaged by the explosion, including a pharmacy and a hospital./SCREENGRAB

At least four people were killed when a lorry laden with explosives detonated in Tolima province, western Colombia, on Sunday, a local official has said.

A two-month-old baby girl was among the dead, Tolima governor Adriana Magali Matiz wrote in a post on X.

The lorry exploded near a military base in the town of Planadas, damaging a nearby hospital and several other buildings.

Governor Matiz called the attack in Planadas "a vile and criminal act that we reject with absolute forcefulness".

"Attacking the civilian population and putting at risk the lives of our soldiers and the Tolima families is crossing a line that we will not tolerate," she added on X.

President de la Espriella has not yet commented on this latest attack but strongly condemned an earlier incident in which a police officer was killed and another six were injured when a motorcycle rigged with explosives was detonated in southern Huila province on Saturday.

President de la Espriella was sworn into office in August after campaigning on a tough-on-crime platform.

In less than a month, he had put an end to peace talks with some of Colombia's illegal armed groups, negotiations which had been started under his left-wing predecessor Gustavo Petro.

"In my government, criminals will have no political status, no leniency, and no impunity," de la Espriella wrote in a post on social media at the time.

At the start of his presidency, Petro had advocated for a "total peace strategy", arguing that only talks could lead to an end to the violence perpetrated by Colombia's many armed groups.

But after repeated breaches of the terms of the negotiations, Petro put some of the peace talks on hold.

De la Espriella has gone further, expanding his crackdown on all of the country's illegal groups, including bombing their camps.

These groups have in turn stepped up their attacks on the security forces, in some instances using drones - rather than cars or motorcycles - to transport the explosives.

In one of them, carried out on 23 October, a marine infantryman was killed and four injured aboard a Navy boat in Cauca province.