Colombians voted to select a successor to President Gustavo Petro in an election Sunday, as armed guards and police kept watch. The left-wing senator and far-right newcomer will face each other in a runoff on June 21, with security a top issue. Key points and original sources are listed below.

• Colombians voted to select a successor to President Gustavo Petro in an election Sunday, as armed guards and police kept watch. Candidates Iván Cepeda and Abelardo de la Espriella advanced to the second round. ___ This gallery was curated by AP photo editors....S1

• The left-wing senator and far-right newcomer will face each other in a runoff on June 21, with security a top issue. Far-right outsider Abelardo de la Espriella will face left-wing Senator Ivan Cepeda in the runoff for Colombia’s presidential election next mon...S2

• Colombians headed to the polls to choose a new president in a high-stakes election.S3

• Surveys are predicting a close, three-way race between a veteran leftist candidate, a right-wing senator and an independent businessman, which is likely to go to a second-round run-off.S4

• The election tests the legacy of the country’s first leftist leader against a rising far-right outsider and a traditional conservative.S5

• Senator Ivan Cepeda is leading two right-wing rivals in the first round of an election dominated by security and economic concerns. On Sunday, voters in the South American country of Colombia are facing a choice. Four years ago, they elected the first left-win...S6