Violence escalates in Colombia with dozens of attacks before presidential vote

Violence in Colombia's southwestern region has raised security concerns ahead of a presidential election. Rebel groups have staged attacks with explosives and drones, including a deadly blast on a highway between Cali and Popayan, resulting in a death toll of 21 people. Authorities blame the FARC-EMC for the explosion, a group seeking to control the area for illicit activities such as mining and drug trafficking