A landmark peace deal, which was signed by Colombia’s President Juan Manuel Santos and Farc leader Timoleon Jimenez last week, rejected by the Colombian public.
With counting completed from 98% of polling stations, the no vote led with 50.23% to 49.76%, a difference of 61,000 votes.
The signing ceremony, the culmination of four years of negotiations in Havana, was attended by world leaders including US Secretary of State John Kerry, UN Secretary General Ban Ki-Moon and Raul Castro, the President of Cuba.
Santos had been confident of a yes result and said during the campaign that he did not have a plan B and that Colombia would return to war if the no vote won. But the result came as a surprise for many.