Its confusing actually.
The title of news below says:
"Attack ruled out in Hormuz tanker incident"
http://gulfnews.com/news/gulf/uae/attack-ruled-out-in-hormuz-tanker-inci...

......but the content says:
“Since one of the crew saw a flash on the horizon immediately before the blast, the company suspects it was highly likely an attack,” the ministry was quoted as saying.
The ministry said one crew member was injured and the ship was partly damaged but able to keep sailing.
Junto Endoh, general manager in the Doha liaison office for Mitsui OSK Lines, said the damage was caused by “maybe an attack, not a spontaneous accident; it may be a terrorist attack.”