The National Liberation Army, the country's second-largest leftist rebel group, is in preliminary peace talks with Bogota over the Colombian conflict that has left 220,000 dead and displaced 5.3 million.
In a statement by leaders of the ELN published on its website dated today, the group said the US has helped set the course of the war for decades.
"Their Pentagon and CIA have been designers of low intensity war and state terrorism in our country that has claimed millions of victims," the group said in a statement.
The ELN hailed the recent naming of US envoy Bernard Aronson to the peace talks. But it called for the country to not play the role of "innocent observer."
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"It should be on the table as directly responsible for the war and its disaster, and it must make commitments to rebuild Colombia in peace," the statement said.
The FARC, the country's largest rebel group, announced on Saturday they had made a new step toward peace after reaching a deal on demining.