At least 11 people were killed and another dozen injured when gunmen opened fire on locals who had gathered at a football pitch in the city of Salamanca in central Mexico on Sunday.
Witnesses said armed men arrived at the grounds in several vehicles and shot at those gathered there seemingly indiscriminately.
Many families had stayed behind to socialise after a match between local clubs. At least one woman and one child were among those killed.
The motive behind the shooting is not yet clear. Guanajuato, the state in which Salamanca is located, registered the highest number of murders in the whole of Mexico last year.
Neighbours reported hearing at least 100 shots ring out as the gunmen opened fire at the Cabañas pitch in the Loma de Flores neighbourhood.
Local and federal security forces are now investigating the deadly shooting.
This incident came just a day after several violent occurrences in the city where a total of five men were killed and another was abducted.
Guanajuato has seen a spike in violence committed by various gangs involved in oil and fuel theft as well as drug trafficking and extortion.
Salamanca, which is home to a significant Pemex refinery, has been particularly subjected to violent, gang-related attacks.
Analysts attribute much of the brutality to the rivalry between the Jalisco New Generation Cartel (CJNG) and the Cartel de Santa Rosa de Lima (CSRL).
Last year, the US State Department designated the CJNG as a Foreign Terrorist Organisation and imposed sanctions on the CSRL.
Mexican President Claudia Sheinbaum recently handed over 37 criminal suspects to the US, aiming to strengthen cooperation in counternarcotic efforts amid rising concerns of violent gang activity.
