Colombia's military says 57 soldiers have been kidnapped by civilians in the country's south-western Micay Canyon area, BBC reported.

It says 31 soldiers were seized on Saturday while the rest were abducted on Sunday by a group of more than 200 people. 

The military says the civilians are acting under pressure from dissidents of the Farc rebel group which agreed a peace deal with the government in 2016.

The mountainous region is a key zone for cocaine production and remains one of the most tense in the country's ongoing conflict with rebel groups, according to BBC.