A video has emerged of a mysterious group of men who claim to have taken the law into their own hands, attacking and killing people they say are linked to a cartel. A deadly attack on a financial office located in the Mexican state of Veracruz saw four people killed and two injured, with the attack now being claimed by the 'Cobra Group'. An armed group stormed the offices of a financial company in the María de la Piedad neighbourhood of Coatzacoalcos, a southern port city, opening fire without