Electoral authority shows right-wing Keiko Fujimori with a marginal advantage over Roberto Sánchez.
Keiko Fujimori and Roberto Sánchez will compete in the June 7 runoff that pits right versus left.
Voters shook up the political landscape, setting up a runoff between right-wing firebrand Abelardo De La Espriella and leftist Iván Cepeda.
From fraud claims to a deflated centrist vote, find out about the May 31 presidential election ahead of what will be a left-right June 21 showdown.
"Si gana la izquierda en Colombia, esa decisión de aumentar el salario mínimo en más del 20 por ciento será histórica", dice el vicepresidente de AS/COA.
"Colombia tiene un récord excelente de organizar elecciones libres aun bajo condiciones subóptimas", dice el vicepresidente de AS/COA.
Current unrest reflects fractured political alliances and broader social changes, with existential implications for President Rodrigo Paz.