From Strategy Page:
March 15, 2009: FARC uses a lot of landmines, and civilians are the more frequent victims. Last year, FARC and drug gang landmines killed 149 and wounded 563, In the last 18 years, since the rebels and drug gangs adopted land mines on a large scale, these weapons have killed over 7,500. Nearly ten percent of the victims were children.
The army and police move around a lot more now that they are chasing the rebels and drug gangs out of rural areas, and use a lot of foot patrols moving cross country in unpredictable ways. Against that threat, FARC and ELN have had some success with landmines. There are lots of new Chinese and old Russian landmines on the black market, and manufacturing landmines is easy enough that local artisans sometimes do it for special orders from leftist rebels or drug gangs. There are a lot of dirt roads in the rural areas where the drug gangs and FARC operate, and larger anti-vehicle mines are a danger to government forces and civilians, or even bad guys who didn't get the memo on where they were planted.
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My Comment: A good summary on the evolving war between Colombian forces and FARC guerrillas.