Built in 1986 by American firm OXY, the 771km Caño Limón-Coveñas pipeline has been operated by Ecopetrol since 2011 and has a 220,000b/d operating capacity. The line runs from the Colombia-Venezuela border to Colombia's Caribbean port of Coveñas. The pipeline has been targeted by guerillas. Since 2012, a number of bombs have been set off, which have left the line on standby on several occasions. Amylkar Acosta, Colombia's energy and mines minister, revealed in an interview that an average of 35,000b/d was not exported during 2013 because of halted operations stemming from rebel group the ELN's (Ejército de Liberación Nacional) attacks. Beyond the impact on export volumes, the attacks have led to spills that have polluted drinking water.