Mexico, a helicopter giving its services to the stat-run oil company PEMEX fell down late on Friday killing eight people. Civil Aeronautics Authorities said the helicopter Bell-402 was travelling from southeastern Campeche state to Veracruz, west of Mexico, when according to witnesses it turned into fire in the air.According to the sources, six mechanics aboard the helicopter and the two pilots died on the spot. The cause of the accident was not known.