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The wood-and-fibre-glass vessel is thought to have sailed from the Colombian port of Tumaco, covering thousands of miles before it was stopped.

Already displaced by previous flare-ups of armed conflict, the group lives in a hard-to-reach jungle area north of the town of Tumaco.

In Tumaco, Reuters journalists saw settlements within 200 meters of the Transandino pipeline.

Reuters accompanied a police unit tasked with tackling oil theft in September to two sites near Tumaco, a Pacific port in southwest Colombia that is the terminal for the country's Transandino oil pipeline.

Much of the nearby Transandino pipeline - which carries oil from Putumayo province on the far side of the Andes to Tumaco - runs above ground, making it an easy target for thieves.