Former rebel Gustavo Petro wins Colombia's presidential election
Outgoing conservative President Iván Duque congratulated Petro shortly after results were announced, and Hernández quickly conceded his defeat.
A child sits in the "Rodolfoneta" holding a national flag during a caravan showing support for president candidate Rodolfo Hernandez a day ahead of the country's presidential run-off, in Bucaramanga.
About 21.6 million of the 39 million eligible voters cast a ballot Sunday. Control has been above 40% in every presidential election since 1990.
U.S. Secretary of State Antony Blinken said in a statement that the Biden administration looks forward to working with Petro.
Petro won 40% of the votes in the initial round and Hernández 28%, but the difference quickly narrowed as Hernández began to attract so-called anti-Petrista voters.