Tijuana's public security spokesman says a fleet of brand new patrol cars has been burned in a Molotov cocktail attack.

Ernesto Alvarez says the 28 vehicles were hit in the predawn attack at a Mazda dealership. Six were destroyed, the rest damaged but possibly reparable.

Tijuana is just across the border from San Diego. Like other border communities, it has faced an upsurge in violence in recent years associated with drug cartels.