Lax American gun laws mean weapons are readily available to buy and smuggle south of the border

Mexico was rocked this week by a wave of brutal violence after the capture of the drug lord Nemesio Rubén Oseguera Cervantes, AKA “El Mencho”, as members of his powerful Jalisco New Generation Cartel blew up trucks, fired on police stations and engaged in gun battles with Mexican security forces.

The chaos eventually calmed but not before 62 people had been killed, including a pregnant woman caught in the cross fire. The scale of the carnage, as well as the arsenal involved, has underscored a key element of Mexico’s struggle against organised crime: cartels are armed to the teeth, and most of their weapons are trafficked from the US.