Gulf oil spill fast becoming worst in years, agencies warn

By Jonathan Saul and Catherine Cartier LONDON, Aug 12 (Reuters) - A vast oil spill in the Gulf is quickly becoming one of the world’s worst in years after being allowed to spread almost unchecked for weeks, according to international agencies, satellite imagery and environmental groups. The slick off the coast of Oman from a grounded tanker carrying Russian crude had reportedly reached the mainland by Wednesday, the U.N.'s shipping agency told Reuters.