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A rebel attack earlier this week has reportedly halted flows through Colombia’s second largest pipeline.

According to Reuters, flows through the Caño Limon-Coveñas pipeline have been halted after a suspected attack by a far left rebel group.

The 210,000 barrel per day Caño Limon-Coveñas pipeline transports crude from fields operated by Occidental Petroleum to the port of Covenas.

According to local reports seen by Upsteam, the pipeline was attacked late Monday in the Cubara municipality of the Boyaca department.

Further details about the attack have not been disclosed.

Colombia’s Ecopetrol reportedly believes that the attack was launched by the National Liberation Army (ELN), Colombia Reports said.

In separate attacks on Monday, alleged ELN rebels also killed three soldiers and injured one soldier in the northern part of the country and killed two policemen in the southwestern part of Colombia, Colombia Reports said.

Colombia produced 1 million bpd of petroleum and other liquids in 2015, according to the U.S. Energy Information Administration.

Colombia’s oil production grew by an annual average of 11 percent from 2008 to 2013, but rebel attacks and low crude prices have stalled growth in recent years, the EIA added.

The U.S. is the largest consumer of Colombian oil exports, with Colombia exporting 370,000 bpd to the United States in 2015.

The EIA estimates that Colombia averaged 41,000 bpd of unplanned production disruption in 2015.