A 1-year-old baby is among those killed, as well as five women and seven men, according to BNO News. Five further victims were taken to an area hospital with non life-threatening injuries. The attack happened just after 9pm local time (3am BST) in Minatitlán, a city in Veracruz state.
The city is around 500km southeast of Mexico City.
A motive for the mass shooting was not immediately known.
Witnesses told local media that the gunmen were possibly looking for someone.
The state’s Secretary of Public Security Hugo Gutiérrez Maldonado said: “Federal and state forces have launched a strong search and capture operation for those responsible for the events that happened in Minatitlán.”
More to follow…