Colombian leftist Gustavo Petro came out on top in the first round of the Andean country's presidential election on Sunday and will face a surprise contender - businessman Rodolfo Hernandez - in a second round on June 19.
Petro, a former member of the M-19 guerrilla movement who has vowed profound economic and social change, had 40.3% of votes, national registry office tallies showed, with 99.9% of ballot boxes counted.
