MEXICO CITY — Top Mexican security officials said Thursday that there is no evidence that true paramilitary groups are operating in Mexico, countering video boasts by a shadowy group of masked men who asserted responsibility for the torture-murder of 35 alleged drug cartel members last week. A group calling itself the Zeta Killers said it dumped the half-naked, bound and beaten corpses of 11 women and 24 men at a busy intersection in the tourist zone of Veracruz last week. Read full article >>