Violence against candidates has reached a record level as gangs push to control more territory.
The shooting took place near the departure terminal at Vancouver's airport and a man was fatally shot, Canadian officials said, indicating that it was a gang related incident.
Police said the dumping of bullet-riddled bodies in different parts of the country indicates there is a fight going on between organised crime groups.
A group of heavily armed men burst into a hostel restaurant frequented by truck drivers and opened fire in Guanajuato state.
Honduran President Juan Orlando Hernandez, grappling with a recent wave of prison killings, had ordered the army and the police on Tuesday to take full control of the country's 27 prisons, which are badly overcrowded with some 21,000 inmates.
No guns or knives were used in the killings, which prison officials said appeared to have been sparked by a "rift between prisoners who belonged to the same criminal group and were involved in drug trafficking in the state."
A gun battle broke out between prisoners and security forces after authorities launched an operation to halt the smuggling of weapons inside a prison in Ciudad Victoria.
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