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BBC: "The FARC has been hit hard in recent years by Colombian government forces.
But the latest attacks have raised questions as to whether the rebels are back on the offensive.
The issue is being debated almost daily by politicians and the media, with some arguing that the security policies of President Juan Manuel Santos have emboldened the rebels.
Santos categorically rejects this.
Speaking just after the Cauca attacks, he insisted that the rebels were acting "out of desperation"."
