Huge oil slick hitting Oman's shoreline as agencies warn of disaster

By Jonathan Saul and Catherine Cartier LONDON, Aug 12 (Reuters) - A vast oil spill from a leaking tanker has started to hit Oman's coastline, its environment agency confirmed on Wednesday, in what threatens to become one of the world’s worst in years after spreading largely unchecked for weeks. The oil could end up impacting 40 km (25 miles) of coast near Ras Madraka as well as Masirah Island, the agency said. The slick now covers an area of more than 2,000 square km, said John Amos, an oil…