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Former right-wing Colombian paramilitary chief Herbert Veloza said he and his men killed 3000 "more innocent than guilty" people in 10 years of fighting, and that many bodies were tossed into a river.
"We killed people merely because they were singled out" as followers or supporters of leftist guerrilla groups, Veloza told El Espectador in his jail cell.
One of the 32,000 members of the United Self-Defence Forces of Colombia who turned in their weapons and disbanded in 2006 after long negotiations with President Alvaro Uribe, Veloza could face trial in the United States for drug smuggling.