Meanwhile, the Organization of American States said Tuesday that right-wing paramilitary groups were responsible for a massacre that left at least eight people dead in the northern Curumani region earlier this month. The OAS says the United Self-Defense Forces of Colombia, or AUC, took hostage and killed at least eight people after clashes with leftist guerrillas. The AUC had previously agreed to a ceasefire with the government. Critics say the ceasefire has done little to prevent the AUC from carrying out drug smuggling and other criminal activities.