BOGOTA, Colombia (AP) — Colombia and the National Liberation Army, or ELN, formally began a six-month cease-fire Thursday as part of a process to forge a permanent peace between the government and the country’s last remaining rebel group.

The cease-fire agreement, , comes amid skepticism among some Colombians that the peace process can fully end an insurgency dating back to the 1960s or halt the alleged involvement of the group's estimated 5,000 remaining members in drug trafficking. The ELN leadership denies involvement in the drug trade.

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