Story highlights Mass grave could be the largest in Mexico, state's attorney general says

Government sent federal police to help fight crime in Veracruz

(CNN) A mass grave containing more than 250 human skulls was uncovered in central Mexico, most likely the victims of drug cartels over the years, authorities said.

The mass grave found in Veracruz state could be the largest in Mexico, state attorney general Jorge Winckler told CNN affiliate Televisa.

Veracruz is "one big mass grave," Winckler told the affiliate Tuesday.

The remains appear to be victims of organized crime violence killed in recent years.

The identification process has been slow and complicated, Winckler said, but authorities are working to match the skulls using information on the database of missing people.

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