Prosecutors in Chiapas state said Tuesday that most of the children were between two and 15 years old, but three babies aged between 3 and 20 months were also found during a raid Monday at the house in the colonial city of San Cristobal de las Casas.

Indignation grew after some local media published horrific photos of the skinned corpse, apparently leaked by city police officers.

Hundreds of federal police blocked highways in and around the Mexican capital Wednesday in open revolt against plans to absorb the officers into the newly formed National Guard.