The acting governor of Caqueta, Patricia Vega, told local media she had no doubt that the Farc was responsible.

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FARC-held areas of Caqueta and Putumayo, thus, it is hoped, cutting the guerrillas' income, and encouraging them to seek peace.

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After one mayor in Caqueta was killed, 22 others fled to Florencia.

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Pinzon on Friday condemned the rebel group for a separate incident, attacks in Caqueta that left three civilians dead, one of them a baby.

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But much of the rest is to set up a new army anti-drugs brigade to operate in Caqueta and neighbouring Putumayo, the site of most of Colombia's 120, 000 hectares (296, 000 acres) of coca.

ECONOMIST: Colombia