Attackers shot a mayor-elect at least five times at a veterinary clinic in a Mexican border state Friday night, officials said.
Ricardo Solis Manriquez was in critical condition at a local hospital after one of the bullets hit him in the head, said Carlos Gonzalez Estrada, a spokesman for the attorney general's office in Chihuahua.
Solis, the mayor-elect of the town of Gran Morelos, was scheduled to take office October 9.
The shooting was the latest in a string of attacks against elected officials in Mexico, where at least four mayors have been killed in the past two months.
A leading gubernatorial candidate also was killed in late June.
On Thursday, authorities said gunmen killed Prisciliano Rodriguez Salinas, the mayor of Doctor Gonzalez, a small town in the border state of Nuevo Leon.