Smoke raises from the fuel tanker Shoko Maru after it exploded off the coast of Himeji, western Japan, in this photo taken by Kyodo

Smoke raises from the fuel tanker Shoko Maru after it exploded off the coast of Himeji, western Japan, in this photo taken by Kyodo May 29, 2014. A fuel tanker captain is missing and four crew members have sustained severe injuries following an explosion aboard the vessel off Himeji, in western Japan, Kyodo news reported. Mandatory credit REUTERS/Kyodo (JAPAN – Tags: DISASTER MARITIME) ATTENTION EDITORS – FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. MANDATORY CREDIT. JAPAN OUT. NO COMMERCIAL OR EDITORIAL SALES IN JAPAN. YES