The threat of political violence is casting a shadow over the lead-up to Mexico's 2018 presidential election, following the murders of six more public officials.
Mexico is coming off its most violent year in history. There were more than 23,000 homicides in 2017, as drug cartels fought for territory.
Aspiring political candidates worry they will be the next target, and that's creating fears for the democratic process.
Al Jazeera's Manuel Rapalo reports from Mexico City.