Two slicks appear in Gulf as huge oil spill off Oman threatens disaster

(This story has been refiled to remove the images, with no changes to text) By Nilo Tabrizy, Catherine Cartier and Jonathan Saul Aug 14 (Reuters) - Two slicks have appeared in Iranian waters, satellite imagery and video verified by Reuters show, as tit-for-tat attacks on oil tankers and other vessels by Iran and the United States spark concerns about environmental damage to the Gulf.