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Other hotspots for recruitment were Putumayo and Cauca Valley, where the conditions of violence are similar.

"If you look at where these attacks are happening, it's in the departments of Cauca, Nariño, Putumayo, Arauca, Norte de Santander and Caquetá, because that's where the biggest coca plantations are, and where the illegal mining is."

It is most active in the provinces of Caquetá, Guaviare, Meta and Putumayo.

Darkness had descended on Colombia's southern Putumayo province one February night last year when gunfire roared through the air, shattering the peaceful dusk.

Darkness had descended on Colombia's southern Putumayo province one February night last year when gunfire roared through the air, shattering the peaceful dusk.