Mexico violence: 12 police killed in one week in Guanajuato

"One of those killed was María Sonia Arellano, a decorated officer who was kidnapped along with her husband and son in the city of Irapuato.

While her son and husband were freed, Ms Arellano's body was later found dumped and dismembered.

The powerful criminal group Cartel Jalisco Nueva Generación (CJNG) said it was behind her murder."

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