Eight men were killed in an attack on a funeral in a rural area of Guerrero, Mexican police said.
A total of at least 13 people were slain over the weekend in the southern state plagued by drug violence.
In a statement, Atoyac de Alvarez municipal police said officers found seven dead and two injured early Sunday morning at the scene of a vigil. One of the injured later died.
The statement said the funeral-goers were attacked by masked men firing large caliber rifles favored by drug cartels as they mourned the victim of shooting several days earlier.
Meanwhile, Acapulco police said Sunday that three bodies were found dumped in a vacant lot in the resort city. A fourth was found decapitated in a car and another man died in a shootout with police.