Iran's Islamic Revolutionary Guard Corps claimed on April 1 that 37 US military officers were killed in an attack on a covert gathering point in the UAE, as part of five naval operations launched since dawn, according to an IRGC statement.

The claims could not be independently verified and should be treated with caution, as Iranian military statements have frequently overstated operational results during the conflict.

The IRGC said its naval forces carried out the operations as part of the 89th wave of its "Operation True Promise 4," using a combination of Qadir ballistic and cruise missiles and attack drones.

The Guard claimed to have destroyed two early warning radar systems operated by US forces and installed on a maritime structure in UAE waters. It also said it struck an Israeli-linked oil tanker called "Aqua One" in the central Persian Gulf, which it said was burning.

The IRGC said it hit a location where US officers were gathered outside the perimeter of the US Fifth Fleet in Bahrain with drones and ballistic missiles, claiming large numbers of senior naval officers were transferred to hospitals in Manama.

It also said it struck a Chinook helicopter preparation centre and equipment storage facilities at Al Udeid base with missiles and drones.

The statement said drone swarms were launched at the USS Abraham Lincoln carrier group in the northern Indian Ocean, claiming satellite imagery showed the group had retreated deeper into the ocean.

The IRGC said that the Strait of Hormuz remained under its control and would not be reopened through what it called the "farcical displays" of the US president.

The Pentagon's most recent official casualty count, issued on March 31, put US losses since the start of the war at 13 killed and 348 wounded.

Washington and Tehran have given sharply divergent accounts of military losses throughout the conflict, and independent verification of battlefield claims from either side has been extremely difficult given Iran's internet blackout and restricted media access across the region.

The announcement comes as UAE authorities have barred Iranians from entering Dubai and Abu Dhabi on April 1 as part of efforts to clamp down on potential Iranian attacks. 

Some 250,000 Iranian passport holders are believed to be living in the UAE, with many more Iranians entering as dual nationals of other countries.