The electoral mission described the first round of voting in Colombia's presidential race as 'a lesson in democracy'.
Far-right lawyer Abelardo de la Espriella beat left-wing Senator Ivan Cepeda in the first round, upending expectations.
Abelardo de la Espriella will face left-wing Senator Ivan Cepeda in the run-off for Colombia’s presidential election.
Left-wing senator Iván Cepeda will face Trump admirer Abelardo de la Espriella at the final ballot on 21 June.
The left-wing senator and far-right newcomer will face each other in a runoff on June 21, with security a top issue.
Colombians headed to the polls to choose a new president in a high-stakes election.
The contest is largely a three-horse race between a left-wing senator, a businessman and a right-wing lawmaker.
The former Colombian president reflects on peace, conflict and the return of violence.
In Colombia, FARC dissidents say they returned to war after a historic peace deal failed to deliver security
Al Jazeera’s Teresa Bo reports from Bogota.
A big challenge for Colombia's next president will be how to reduce country's debt without sacrificing social gains.
Armed groups have taken the conflict to the skies by making greater use of cheap, widely available drone technology.
Rights office says the violence could hinder 'exercise of political rights' ahead of May vote to replace Gustavo Petro.
Annual report by ICRC finds worsening conditions for Colombian civilians amid continued fighting between armed groups.