The Federal Police is investigating the incident.
But they are not investigating the information leaked by unknown sources, just the leak itself.
The reported abuse happened in a restaurant in the state of Tabasco.
The Veracruz state prosecutor said Monday at a news conference that the police chief and six officers from Papantla are in custody.
English29/02/2016
Neighbor killed Salma Hayek's dog
He said he shot his rifle because the animal was invading his property.
A pellet from a pellet gun had nicked an artery and the dog "slowly bled to death".
Francisco Javier Gómez's gun and badge were found in one car used by the killers of Mayor Gisela Mota.
The FBI investigation started with a confidential informant who offered to connect the Sinaloa cartel with an Italian organized crime group that claimed it had influence at U.S. and Spanish ports.
16 others died on the beaches of the Baja California peninsula.
A neighbor says an old friend of Syed Farook lives in the house.