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They come from the central state of Zacatecas, which lies on key drug trafficking routes.
BBC: Mexico thwarts 'plot to kill' Monreal brothers
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Troops in Mexico pursued and shot dead 12 people after coming under attack in Zacatecas state, officials have said.
BBC: Mexico troops kill 12 in gun fight in Zacatecas state
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Gabriel Quadri of the New Alliance, who trails far behind in the polls, spoke to supporters in the northern state of Zacatecas.
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Earlier, the Mexican Navy said it had arrested 18 drug trafficking suspects in Zacatecas, including 12 boys and a woman with a baby.
BBC: Mexico troops kill 12 in gun fight in Zacatecas state
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Roberto Garcia Zamorra, an immigration expert from Zacatecas University, predicted that Mexico will face a crisis unless it relies less on money from migrants.
NPR: Mexico Hosts Conference on Immigration Issues
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Zacatecas, located in central Mexico, lies on key drug trafficking routes.
BBC: Mexico troops kill 12 in gun fight in Zacatecas state
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Friday's warning also specifies dangers and advises against nonessential travel in parts of the states of Durango, Chihuahua, Coahuila, Jalisco, San Luis Potosi, Sinaloa, Sonora and Zacatecas.
CNN: U.S. broadens Mexico travel warning
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The boy, identified as Jose Armando Moreno Leos by officials, was arrested only three weeks ago by the Mexican Federal Police, according to Arturo Nahle Garcia, state's attorney in Zacatecas.
CNN: 13-year-old assassin murdered in Mexico
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Zacatecas may be a poor showcase.
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But the Zetas have been pushing westward from their strongholds on the Gulf Coast, and they had already taken the neighboring state of Zacatecas, so there was no reason to doubt that they coveted Jalisco, a rich prize, or that this was indeed their atrocity and their message to Guadalajara.
NEWYORKER: The Kingpins