At least 12 people were killed today, Sunday, in an armed attack during a celebration in the city of Salvatierra in the state of Guanajuato in central Mexico, as reported by the "Agence France-Presse" according to local authorities. The attorney general's office in Guanajuato, one of the most violent states in Mexico due to the presence of criminal gangs, stated, "So far, there are 12 dead."