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UPDATE 10-Saudi Arabia says its oil tankers among those hit off UAE coast

Rania El Gamal and Bozorgmehr Sharafedin

* Riyadh says attack undermines oil supply security

* UAE launches probe without blaming any state or party

* Iran calls incident "worrisome", asks for investigation

* Oil prices rise after attack off bunkering hub of Fujairah

* Graphic on oil tankers attacked: https://tmsnrt.rs/2W4yczs (Adds Fujairah port working normally)

DUBAI/LONDON, May 13 (Reuters) - Saudi Arabia said on Monday that two of its oil tankers were among those attacked off the coast of the United Arab Emirates and described it as an attempt to undermine the security of crude supplies amid tensions between the United States and Iran.

The UAE said on Sunday that four commercial vessels were sabotaged near Fujairah emirate, one of the world's largest bunkering hubs lying just outside the Strait of Hormuz. It did not describe the nature of the attack or say who was behind it.

The UAE had not given the nationalities or other details about the ownership of the four vessels. Riyadh identified two of them as Saudi and a Norwegian company said it owned another. Reuters images showed the fourth vessel was the UAE-flagged A. Michel, a fuel bunker barge.

Thome Ship Management said its Norwegian-registered oil products tanker MT Andrew Victory was "struck by an unknown object". Footage seen by Reuters showed a hole in the hull at the waterline with the metal torn open inwards.

A Reuters witness said divers were inspecting damaged ships. The UAE's state news agency said Fujairah port was operating normally.

Iran, which is embroiled in an escalating war of words with the United States over sanctions and the U.S. military's presence in the region, moved to distance itself on Monday.

Iran's Foreign Ministry called the incidents "worrisome and dreadful" and asked for an investigation into the matter.

A senior Iranian lawmaker said "saboteurs from a third country" could be behind it, after saying on Sunday the incident showed the security of Gulf states was fragile.

A United States defence official, speaking on condition of anonymity, said the U.S. military was assisting in the investigation at the request of the UAE government.

Britain's Foreign Minister Jeremy Hunt warned of the risks of "a conflict happening by accident" with an unintended escalation between Washington and Tehran over an unravelling nuclear deal.

CHOKEPOINT

Washington withdrew last year from a 2015 pact between Iran and global powers aimed at reining in Tehran's nuclear plans. Since then, the United States has ratcheted up sanctions on Iran, saying it wanted to reduce its oil exports to zero.

A fifth of global oil consumption passes through the Strait of Hormuz from Middle East crude producers to major markets in Asia, Europe, North America and beyond. The narrow waterway separates Iran from the Arabian Peninsula.

Iran's Revolutionary Guards, designated a terrorist organisation by the United States, threatened last month to close the chokepoint if Tehran was barred from using it.

Oil prices rose on Monday, with Brent crude futures at $72.08 a barrel by 1416 GMT, up $2.07.

Saudi Energy Minister Khalid al-Falih said one of the two Saudi vessels was attacked in the UAE economic zone on its way to be loaded with Saudi crude from Ras Tanura port for delivery to state-owned Aramco's customers in the United States.

The attack did not cause any casualties or an oil spill but caused significant damage to the vessels' structures, he said in a statement.

Trading and shipping sources identified the Saudi vessels as very large crude carrier (VLCC) tanker Amjad and crude tanker Al Marzoqah, both owned by Saudi shipping firm Bahri, which did not respond to a Reuters request for comment.

The UAE Foreign Ministry had said there were no casualties and the Fujairah port operations were normal. An investigation was launched in coordination with international authorities, it said, calling on global powers to prevent any parties trying to harm maritime safety and security.

Dubai and Abu Dhabi stock markets suffered their biggest single-day declines in years on Monday, with Dubai falling 4%. Saudi shares lost 3.6%.

OIL SECURITY

Sunni Muslim allies Saudi Arabia and the UAE have backed U.S. sanctions against Shi'ite Iran, a fellow OPEC producer but regional foe. After the United States ended sanctions waivers that had allowed some nations to continue importing Iranian crude, Washington said Riyadh and Abu Dhabi would help compensate for any shortage in oil supply.

Falih said the attack aimed to undermine maritime freedom and the security of oil supplies to consumers worldwide.

"The international community has a joint responsibility to protect the safety of maritime navigation and the security of oil tankers, to mitigate against the adverse consequences of such incidents on energy markets and the danger they pose to the global economy," he said.

Iranian Foreign Ministry spokesman Abbas Mousavi said the incident "has a negative impact on maritime transportation security" and asked regional countries to be "vigilant against destabilising plots of foreign agents", the semi-official ISNA news agency reported.

The U.S. Maritime Administration said in an advisory on Sunday that incidents off Fujairah, one of the seven emirates that make up the UAE, had not been confirmed and urged caution.

The Maritime Administration had said earlier this month that U.S. commercial ships including oil tankers sailing through Middle East waterways could be targeted by Iran in one of the threats to U.S. interests posed by Tehran.

Washington said it was sending a U.S. aircraft carrier and other forces to the Middle East due to what it said were Iranian threats, while Tehran has called the U.S. military presence "a target" rather than a threat. Iran has said it would not allow its oil exports to be halted.

(Additional reporting by Jonathan Saul and Robin Emmott in London, Idrees Ali in Washington, Saeed Azhar in Dubai and Oslo newsroom Writing by Ghaida Ghantous Editing by Edmund Blair and Mark Potter)