Leaking crude oil from a tanker grounded off a nature reserve in Oman has created a slick covering almost ‌400 square kilometres, a size six-and-a-half times the land area of Manhattan, the country's government said on Monday. The Caroline Bezengi is loaded with close to one million barrels of Russian oil bound for Asia and first reported difficulties on June 8 off Yemen, with two maritime security sources saying initial assessments indicated a blast had occurred onboard.