Army sources told Reuters the attack occurred early on Wednesday, where only a day before a section of the 220,000-barrel-per-day-capacity Cano Limon-Covenas oil pipeline in the northeastern province Norte de Santander was destroyed in an explosion.

The contractors worked for Independence y Cotransur, which had been contracted to perform maintenance work on the Sibundoy 1 well in Puerto Caicedo, northeast of Putumayo, Ecopetrol said.

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