CHILPANCINGO, Mexico – Five women were found decapitated in the Pacific resort city of Acapulco, authorities in the southern Mexican state of Guerrero said Saturday.

Three of the victims, one of them just 14, were discovered inside a hair salon in the city center. All three were bound hand-and-foot, a police source said.

A fourth decapitated woman turned up inside an abandoned car in Acapulco’s Lazaro Cardenas neighborhood, while the fifth victim was found behind a church in the Mozimba district.

The body of the fifth woman was accompanied by a message, the source said, while declining to offer any further details.

Drug cartels and other criminal organizations often leave such “calling cards.”

Police say they have yet to determine whether all five killings are related.

Acapulco, now thronged with Mexicans on Easter break, has been the scene of numerous drug-related killings linked to a broader battle among three different cartels for control of Guerrero, where marijuana and opium poppies are grown.

Gunmen clashed with federal and state security forces on April 4 in an incident that featured the use of grenades, while 22 people died in January in a massacre blamed by the self-proclaimed Cartel Independiente de Acapulco.

The violence has prompted foreign tourists to stay away from Acapulco.