Though many areas of Mexico are peaceful and voters are calm, feeling it is their duty to vote and that it is important to do so, not all areas are peaceful:
Ahead of the polls opening, the CNTE teachers' union attacked the offices of five political parties in Chiapas state in the south of the country.
In Guerrero state, explosive devices were thrown into a conservative party's office.
Meanwhile in Oaxaca, as well as Guerrero, tens of thousands of ballot papers were burnt by protesters.
A former mayor was shot dead outside a polling station in the same state.
A number of candidates and numerous campaign workers have also been killed in drug-related violence.
Link to BBC article