Four people died after a man armed with an M1 rifle opened fire during a festival in the southern Mexican town of Huehuetan, the Guerrero state Attorney General's Office said Thursday.
The shootings took place after midnight Wednesday at a street dance that was part of celebrations of the feast day of the town's patron saint.
One person was declared dead on the spot and three others, one of them a 17-year-old girl, died later at a hospital, the state AG's office said.
Nine other people were wounded.
Authorities have identified the shooter and are searching for him, but declined to release his name.
While officials have not speculated on his motive, media accounts said the assailant arrived at the dance in pursuit of one of the eventual victims. EFE