The US military has released a video which it says shows Iranian special forces removing an unexploded mine from the side of an oil tanker damaged in an attack in the Gulf of Oman on Thursday.
The US also released images of the Japanese tanker apparently showing the unexploded mine before it was removed.
A Norwegian tanker in the gulf also reported being hit by three blasts.
The US accused Iran of being behind the attacks. Iran said it “categorically” rejected the allegation.
The blasts came a month after four oil tankers were damaged in an attack off the coast of the United Arab Emirates. The US blamed Iran for that attack, but did not produce evidence. Iran also denied those accusations.
Tensions between the US and Iran have escalated significantly since US President Donald Trump took office in 2017. He abandoned a nuclear deal that was brokered by the Obama administration and significantly tightened sanctions on Iran.
On Friday Mr Trump repeated the US assertion that Iran was behind the incident in an interview with Fox News.
He also said it was unlikely that Iran could close the Strait of Hormuz – a vital shipping lane through which a third of the world’s seaborne oil passes every year – but if it did, the strait would not remain closed “for long”.
Asked how to stop Iran, Mr Trump said: “We’ll see.”
Oil prices jumped as much as 4% after Thursday’s incident.
What we know about the explosions
According to the US account of events, US naval forces in the region received distress calls from the Norwegian-owned Front Altair at 06:12 (02:12 GMT) and from the Japanese-owned Kokuka Courageous at 07:00, following explosions, and moved towards the area.
It said the USS Bainbridge observed Iranian naval boats operating in the area in the hours after the explosions, and later removing the unexploded mine from the side of the Kokuka Courageous.
The crews of both vessels were evacuated to other ships nearby. Both Iran and the US later released pictures showing rescued crew members on board their vessels.
BSM Ship Management, which manages the Kokuka Courageous, said the ship’s crew abandoned ship after observing a fire and an unexploded mine.
Apparently disputing the US version of events, Yutaka Katada, the president of the ship’s operator, Kokuka Sangyo, said members of the crew had reported “that the ship was attacked by a flying object”.
The Kokuka Courageous was about 30km (20 miles) off the Iranian coast when it sent its emergency call.
The Front Altair was carrying naphtha, a petrol product, from the United Arab Emirates to Taiwan. The Kokuka Courageous was carrying methanol from Saudi Arabia to Singapore.
According to global satellite monitoring company Iceye, the damage to the Front Altair caused some oil spill in the waters around the ship.
What reaction has there been?
US Secretary of State Mike Pompeo said at a news conference in Washington: “It is the assessment of the United States that the Islamic Republic of Iran is responsible for the attacks.
“This assessment is based on intelligence, the weapons used, the level of expertise needed to execute the operation, recent similar Iranian attacks on shipping, and the fact that no proxy group operating in the area has the resources and proficiency to act with such a high degree of sophistication.”
The UK Foreign Secretary Jeremy Hunt said his country’s “starting point” was to “believe our US allies”.
China’s foreign ministry said in a statement that all sides should exercise restraint. The UAE described the attacks as a “dangerous escalation”.
How did Iran respond?
Iranian President Hassan Rouhani on Friday accused the US of posing “a serious threat to stability in the Middle East”, without referring directly to the attacks in the Gulf of Oman.
He reiterated a call for international parties to the 2015 nuclear deal to honour their commitments, following a unilateral withdrawal by the Trump administration.
In a statement released on Friday, the Iranian mission to the United Nations said it rejected what it called “unfounded” and “Iranophobic” allegations by the US.
“Iran categorically rejects the US’ unfounded claim with regard to 13 June oil tanker incidents and condemns it in the strongest possible terms,” the statement said.
Foreign Minister Javad Zarif on Twitter accused the US of making an allegation “without a shred of factual or circumstantial evidence” and attempting to “sabotage diplomacy”.
The footage released by the US on Thursday is rather more convincing than the circumstantial evidence it had provided earlier.
The small white patrol craft in the video is typical of the type used by Iran’s IRGC (Revolutionary Guards) Navy in the Gulf. In recent years, the IRGC Navy has steadily supplanted Iran’s conventional Navy all along Iran’s Gulf coast, from its border with Kuwait in the north all the way down to Pakistan and the Arabian Sea. Its forces have built up a formidable flotilla of small, high-speed, hard-to-detect attack craft armed with mines, missiles, torpedoes and drones.
IRGC commandos regularly practise covert operations and simulated attacks. Some of their craft have come in close proximity to US Navy warships in the Gulf in recent years and there remains the risk of a clash at sea.
Iran has denied any involvement in Thursday’s attacks, saying they were carried out by someone looking to derail Iran’s relations with the international community. There will likely be doubts in Tehran as to whether this video is genuine.
Why are US-Iran tensions so high?
In 2018, the US pulled out of the landmark nuclear deal reached in 2015 that was aimed at curbing Iran’s nuclear activities. The move was strongly criticised by a number of countries, including the closest allies of the US.
In May, President Trump tightened US sanctions on Iran – mainly targeting its oil sector. Iran then announced it would suspend some commitments under the nuclear deal.
In recent months, the US has strengthened its forces in the Gulf – saying there was a danger of Iranian attacks. It sent an aircraft carrier strike group and B-52 bombers to the region.
In response, Iran accused the US of aggressive behaviour. Those tensions rose markedly after the 12 May limpet mine attacks in the UAE.
The UAE blamed an unnamed “state actor”. The US said that actor was Iran, an accusation Tehran denied.
While it is unclear why Iran would carry out a relatively low-level attack on the multinational tankers, observers have speculated that it could have been to send a signal to forces ranged against it that it is capable of disrupting shipping there without triggering a war.
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