A group calling themselves the Matazetas, or 'Zetas killers' in English, has emerged in the Meixcan city of Veracruz.

As the "armed wing of the people", they have vowed to take on the well known Zetas drug gang and proudly claim they were involved in the killing of 49 people last week who they say were associated with the Zetas.

Al Jazeera's Adam Raney reports from Veracruz.