A "state actor" was most likely behind the attacks on four oil tankers off the Emirati coast which and bore the hallmarks of a "sophisticated and coordinated operation", an international investigation has informed the UN Security Council.
Of the four commercial ships targeted in the May 12 attack, one was flying a UAE flag, two were tankers owned by Saudi Arabia, and the fourth was a Norwegian tanker.
There were no casualties but Saudi Arabia has said two of its ships suffered "significant" damage.
The US has accused Iran of being behind the attacks on the oil tankers, which came amidst escalating tensions between Tehran and Washington. The US has sent warships and bombers to the region as part of its response.
"While investigations are still ongoing, these facts are strong indications that the four attacks were part of a sophisticated and coordinated operation carried out by an actor with significant operational capacity, most likely a state actor," said a statement from the UAE, Saudi Arabia and Norway, which jointly probed the attack.
Iran, the country suspected by both the US and Saudi Arabia of being behind the attacks, was not named as responsible by the investigation.
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The UAE ambassador, Lana Nusseibeh, told reporters she did not accuse Iran of responsibility in an informal Security Council meeting about the investigation.
Iran has denounced the attack and denied involvement in the incident.
Saudi Arabia's ambassador to the United Nations, Abdallah al-Mouallimi, was clear that Riyadh believes "responsibility lies on the shoulders of Iran."
He said there was "enough evidence" to demonstrate Iranian responsibility, adding that "if we tolerate a symbolic attack like this ... it opens the door for more."
Diplomats said the assessment of the damage to the four vessels and chemical analysis of the debris recovered revealed "it was highly likely that limpet mines' were deployed."