The Revolutionary Armed Forces of Colombia, or FARC agreed a two month ceasefire with the government troops in order to enter into peace talks.
The two month period ended on Sunday with no deal struck, and so the rebels blew up two southern oil pipelines and planted a bomb on the top coal exporter's northern railway.
Over the last year, rebels have increased attacks against oil and mining installations - bombings of oil pipelines shot up 460 percent in the January-August period to 117 compared with the same period in 2011.

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