LONDON, Feb 28 (Reuters) – Several tanker owners, oil majors and trading houses have suspended crude oil, fuel and liquefied natural gas ‌shipments via the Strait of Hormuz after the U.S. and Israel ‌attacked Iran and Tehran said it had closed navigation, trading sources said on Saturday.

“Our ships ​will stay put for several days,” one top executive at a major trading desk said. Satellite images from tanker trackers showed vessels piling up next to big ports, such as Fujairah in the United Arab Emirates, and not ‌moving through Hormuz.

Multiple vessels in ⁠the area have received VHF transmission from Iran’s Revolutionary Guards that “no ship is allowed to pass the Strait of ⁠Hormuz”, an official with the EU naval mission Aspides told Reuters.

The UK Navy said Iran’s orders were not legally binding and advised vessels to transit with ​caution.

The ​tanker association INTERTANKO said the U.S. Navy ​had warned against navigation in ‌the area – the whole of the Gulf, Gulf of Oman, North Arabian Sea, and the Strait of Hormuz – saying it could not guarantee the safety of shipping.

Greece’s shipping ministry advised vessels on Saturday to avoid the Persian Gulf, the Gulf of Oman and the Strait of Hormuz, according to ‌an advisory seen by Reuters.

Some 20% of ​global oil from producers such as Saudi Arabia, ​the UAE, Iraq, Kuwait ​and Iran pass through Hormuz as well as large volumes ‌of LNG from Qatar.

Fourteen LNG tankers ​have shown signs ​of slowing down, U-turning or stopping in or around the Strait, said Laura Page from consultancy Kpler, who added the number will likely ​rise, posing risks to ‌Qatari LNG exports.

(Reporting by Dmitri Zhdannikov, Marwa Rashad, Shariq Khan ​and Enes Tunagur, Renee Maltezou and Yannis Souliotis; Editing by Aidan ​Lewis, Kevin Liffey and Louise Heavens)