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A police officer and three soldiers were killed and another four injured, with five others also missing. Earlier reports said 15 soldiers died.

The troops were attacked as they were dropped from helicopters.

The cocaine laboratories provide the rebels with their main income. The drugs are mostly moved south through Ecuador and sold to Mexican cartels.

Local reports say the missing journalist, named as Romeo Langlois, was travelling with the army to make a documentary about the fight against drugs and illegal mining.

The soldiers from the anti-narcotics brigade were confronted by a large, and heavily armed, guerrilla unit, which managed to disappear back into the jungle before the military was able to react.

Earlier this month, a senior rebel leader contradicted government suggestions the guerrilla group had been severely weakened, and said it remained ready for battle.

On Friday eight people including a baby were killed in two Farc attacks in the same region.

The BBC’s Jeremy McDermott in Medellin says the rebels are trying to step up their actions and force the government to the negotiating table.