Heavy fighting broke out in northern Mexico on Thursday after security forces detained a son of the jailed drug kingpin Joaquín "El Chapo" Guzmán.
Fighting raged for hours after Ovidio Guzmán López was found in what authorities said was a routine patrol in the city of Culiacán.
Armed men were seen firing on police with bodies strewn in the road.
Police withdrew without Mr Guzmán in their custody to avoid further violence, officials said.
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