bogota colombia marxist eln rebel group say monday agree temporary ceasefire would run mid-january 2018 would effect pope francis arrive andean country visit late week ceasefire first eln due begin oct. end jan. 12 possibility extensions respect president juan manuel santos say televise address country priority protect citizens period kidnappings attack oil pipelines hostilities civilian population cease say two side long say pope visit would good opportunity call ceasefire government say detail verification methods still finalize ceasefire begin immediately national liberation army eln rebel group bomb oil installations kidnap ransom found radical catholic priests 1964. eln government peace talk currently hold ecuador end 53 years war since talk begin february eln continue take hostages ransom launch bomb attack extort foreign oil mine company eln tell reuters last week kill russian-armenian citizen arsen voskanyan april eln practice kidnap civilians key issue peace talk eln tell reuters last week optimistic peace agreement could reach neither side would give grind kidnap pope francis schedule arrive colombia wednesday even five-day visit cities bogota villavicencio medellin cartagena eln say statement website monday say visit pope francis extra motivator accelerate work accord days celebration presence francis pass continue insist advance toward de-escalation conflict complete peace reality colombia eln rebel agree temporary ceasefire start oct.