Police rule out narco killing as cause of death of man found in river in Spain with 'bag of bricks tied around his neck' / US arrests spark cartel 'war' in northern Mexico: 'Like a narco pandemic' / Trial of reputed Mexican cartel leader's son offers cautionary tale for 'narco juniors' / Los narcos mexicanos se pasan al negocio de las tortillas / Who are the MC Comanches? The violent and feared 'narco' bike gang accused of running drugs from Spain's Costa del Sol to the whole of Europe / Family clan who 'sold drugs delivered by narco boats' on Spain's Costa Blanca is arrested / Mexico's weed 'nuns' taking the plant back from the narcos