The attorney general's office in Guanajuato, the violence-plagued state where Irapuato is located, said that 20 others were hospitalized with gunshot wounds.
"It is very unfortunate what happened. An investigation is under way," Sheinbaum said.
A video circulating on social media showed people dancing in the patio of a housing complex while a band played in the background, before gunfire erupted. Reuters was not immediately able to verify the video.
Guanajuato has been for many years one of the most violent regions in the country, where criminal groups fight over routes to price drugs and commit other crimes. On Tuesday, five other people were killed in other parts of the state, according to the attorney general's office.
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