The attack took place in the early morning on the edge of the city of Culiacan in the home state of the Sinaloa Cartel, whose former leader Joaquin "El Chapo" Guzman was recaptured in January.
"It seems that it was an ambush...we think it was an attack by the local cartel," an official at the prosecutor's office said.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)
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