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 socialize after a match between local clubs. Among the deceased are at least one woman and one child.
The motive behind the shooting is not yet clear. Guanajuato, the state in which Salamanca is located, registered the highest number of murders in Mexico last year.
Neighbors reported hearing at least 100 shots ring out as the gunmen opened fire at the Cabañas pitch in the Loma de Flores neighborhood.
Local and federal security forces are now investigating the deadly shooting.
The attack occurred just a day after several violent incidents in Salamanca, where five men were killed and another abducted.
Guanajuato has experienced a spike in violence from various gangs engaging in oil and fuel theft, as well as drug trafficking and extortion.
Salamanca, home to a major Pemex refinery, has been particularly susceptible to gang-related violence.
Analysts attribute many brutal incidents to the rivalry between the Jalisco New Generation Cartel (CJNG) and the Cartel de Santa Rosa de Lima (CSRL).
Both gangs engage in illicit activities that extend beyond Mexican borders, affecting U.S. territories.
In recognition of their violent actions, the CJNG was designated as a Foreign Terrorist Organization by the U.S. State Department last year, alongside recent sanctions on the CSRL.
U.S. President Donald Trump has made fighting drug gangs a priority, criticizing Mexico's inability to contain cartel violence and has even threatened military action against so-called narco-terrorists.
Last year, the U.S. executed several operations against drug trafficking vessels, resulting in the deaths of many individuals involved in the drug trade.
In an attempt to ramp up cooperation with U.S. counternarcotics efforts, Mexican President Claudia Sheinbaum has recently handed over a number of significant suspects to the U.S.