Thirty-one police officers have been arrested in a central Mexican state on suspicion of collaborating with a gang of drug cartel hit men.
The Public Safety Department says the officers were arrested as part of a months-long investigation into alleged ties between police and the Zetas in Hidalgo, a state north of Mexico City.
Ninety-two police were arrested there in June, and the latest 31 were detained Monday.
The investigation began last October, when federal police arrested seven suspected Zeta accountants and found evidence of monthly payments to Hidalgo police from the gang, which is linked to the Gulf cartel.
Hundreds of police have been arrested across Mexico for alleged ties to cartels during federal government's battle against drug trafficking.
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