Colombian rebels have attacked an oil field in the north-west of the country, the state-owned company Ecopetrol says.
It said the attack on the Tibu field near the Venezuelan border, had put the lives of workers and residents at risk. However no-one was injured.
The Colombian military has not specified which group carried out the attack.
The two main left-wing rebel groups in Colombia - the Farc and the ELN - are known to operate in the area.
In recent weeks power stations, oil fields, pipelines and roads have been damaged in actions attributed to the guerrillas.
Ecopetrol says a team working at the Tibu oil field was approached by armed men on Friday.
They threatened the workers before detonating explosives that damaged part of the facility.
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