The bodies were found Wednesday afternoon in a pick-up truck on a hill in an area called El Ejemplo in the state of Sonora, near the border with the US state of Arizona, police said yesterday.
An eighth man who survived the attack told the authorities that he and the victims had just moved drugs "when they were intercepted by several subjects who attacked them," Sonora's investigative police said in a statement.
Four of the victims were identified as men between the ages of 23 and 29. The survivor, who was 25 years old, was hospitalised with a bullet wound.