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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.
He did not say when the mass grave was discovered, but some of the skulls were found with the help of members of Colectivo Solecito, a group of mothers and other relatives of the missing.
For more than two years, the group has searched for their loved ones at the Colinas de Santa Fe area, near the Veracruz harbor.
Martha González, who's part of the group, said she will finally get closure.
"They give us just the bones, but at least I can have them, I can keep it some place where it won't be rained on, where I can put a flower on it," she told CNN en Español.
"And I can know that they are really there and resting."