LONDON (AP) -- Oil prices fell below $70 a barrel Tuesday as Tropical Storm Ernesto veered away from the oil and gas region of the Gulf of Mexico, easing concern that output would be disrupted. Light sweet crude for October delivery on the New York Mercantile Exchange fell 85 cents to $69.76 a barrel in electronic trading by afternoon in Europe. It last traded below $70 on Aug. 18. The fall extended a $1.90 drop on Monday, when it settled at $70.61. October Brent crude at London's ICE Futures exchange dropped 86 cents to $69.96 a barrel. Royal Dutch Shell...