A massacre in a Mexican bar left 11 people dead on Sunday (September 27).
The attorney general's office in the central state of Guanajuato said the bodies of seven men and four women were found at the scene in the city of Jaral del Progreso in the early hours.
Authorities added that another woman was also found with gunshot injuries.
It comes as the country grapples with a record homicide rate - despite the government's promises to tackle gang violence.
Guanajuato, a major car-making hub, has become a recurring scene of criminal violence in Mexico, ravaged by a turf war between the local Santa Rosa de Lima gang and the powerful Jalisco New Generation Cartel.
In July, gunmen killed 24 people at a drug rehabilitation center in Guanajuato.
It was one of the worst mass slayings since President Andres Manuel Lopez Obrador took office - pledging to reduce record levels of violence.