Mexico elections: Polls due to open after campaign marred by violence
Polls are due to open across Mexico for Sunday's presidential, parliamentary and local elections.
Front-runner for president is Andres Manuel Lopez Obrador, the left-wing former mayor of Mexico City who has pledged to crack down on corruption.
If he wins he will oust the two parties that have governed Mexico for nearly a century.
However, campaigning has been marred by some of the worst political violence in the country for decades.
Source: bbc.com
