‘They’re culpable’: the countries supplying the guns that kill Mexico’s journalists

Many of the weapons used in the murders of 119 journalists were imported - and Mexico's laws and culture make tracing them impossible

It was around daybreak when Mexican crime reporter Luis Vallejo received a call from a local police officer telling him that a bag of human remains had been found in the city of Salamanca where he lives.

Vallejo had become accustomed to calls like this: in recent years, violence in Guanajuato, the surrounding region, has spiraled to unprecedented levels amid bloody turf wars between rival cartels.