A Japanese tanker damaged last week in the Strait of Hormuz near Oman was the target of a terrorist attack, the United Arab Emirates state-run news agency has said.
It said remains of home-made explosives had been found on the hull of the M Star, which was damaged last week while travelling from Qatar to Japan.
Two days ago, an al-Qaeda-linked group said it was responsible.
Officials previously said the ship may have been involved in a collision.
The crew of the ship reported an explosion shortly after midnight on Wednesday last week. One person was injured.
The BBC's security correspondent Nick Childs says the news is likely to raise concerns about security for shipping in the strait, a vital strategic waterway for oil supplies from the Gulf. BBC News
