(CNN) — Mexican authorities are investigating the discovery of six severed human heads between the central states of Puebla and Tlaxcala, according to the Tlaxcala Prosecutor’s Office.

It said on X that the heads belonged to men, without providing further details about the case.

CNN has requested more information and is awaiting a response.

Gruesome killings by criminal groups are not uncommon in Mexico.

Earlier this year, authorities in Sinaloa state discovered 20 male bodies with gunshot wounds – including five that were decapitated – on a bridge over a federal highway.

Puebla and Tlaxcala are central states located just over 100 kilometers (62 miles) from Mexico City.

Neither is among the states with the highest levels of violence in Mexico, according to official figures.

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