Leaking crude oil from a tanker grounded off a nature reserve in Oman has created a slick covering almost 400 square kilometers, the country’s government said on Monday. Oman, in its first public disclosure on the environmental impact, said on Monday it was seeking to tackle the oil leak near the Hallaniyat Islands. The oil slick covers some 390 square km (150 square miles), Oman’s Environment Authority said in a statement carried by the state news agency, adding there was no concern for facilities in the area including water desalination plants and tourist facilities. Environmental group Greenpeace last week estimated the slick at around 600 square kilometers, citing analysis of satellite imagery. Ten years down the line, there still were remnants of oil,” he said, referring to a 1989 spill in Alaska.