The concentration zones FARC fighters are gathering at to lay down arms are behind schedule, and many fighters are arriving to construction zones and incomplete infrastructure, reports the Wall Street Journal. The lack of preparation has many concerned that larger programs promised in the peace deal, will be implemented. But security concerns are more pressing -- social activists have been targets of a wave of violence that has killed more than 60 last year, and FARC fighters fear they'll be next once they're unarmed. And experts are concerned that organized crime groups will expand their territory as the FARC withdraws.