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Shock, despair at a crime scene in Monterrey

A woman is held back by another woman as she reacts to the killing of several people at a crime scene in Monterrey, Mexico on August 29, 2012.
A woman is held back by another woman as she reacts to the killing of several people at a crime scene in Monterrey, Mexico on August 29, 2012.Daniel Becerril / Reuters

Gunmen shot dead three men and a woman in Monterrey on Wednesday and left graffiti on a wall at the crime scene reading "Commander X20, at your orders, [signed] CDG [Gulf Cartel]", according to local media.

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Monterrey is Mexico's most affluent city and has long been seen as a model of economic development in Latin America. But it has been ravaged by drug warfare over the last three years.

-- Reuters

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