UK nuclear submarine deployed to Arabian Sea before Iran targets key US-UK base: reports

A British nuclear-powered submarine has been deployed to the Arabian Sea amid rising tensions in the region and came ahead of Iran's failed ballistic missile attempt targeting Diego Garcia, a key U.S.-U.K. military base in the Indian Ocean, according to reports.

HMS Anson - a Royal Navy Astute-class submarine armed with Tomahawk Block IV cruise missiles and Spearfish heavyweight torpedoes - traveled about 5,500 miles from HMAS Stirling, near Perth, Australia, to the region earlier in March.

The submarine is reportedly operating in the northern Arabian Sea, positioning Britain to respond quickly if the conflict escalates.

HMS Anson periodically surfaces to maintain communications with the U.K.'s Permanent Joint Headquarters in London, GB News reported.

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The outlet reported that Anson is typically based at Faslane in Scotland, where an Iranian man has been charged with attempting to gain entry.

The deployment was said to have come shortly after the U.K. government authorized the United States to use British military bases for defensive operations targeting Iranian missile capabilities that have threatened shipping in the Strait of Hormuz.

In a statement, Downing Street said the aim of those operations was to "degrade the missile sites and capabilities" used in attacks on ships, while emphasizing that Britain does not want to be drawn into a wider regional conflict.

Tensions intensified Sunday after Iran launched two ballistic missiles toward Diego Garcia, according to multiple reports. Neither missile reached its target; one reportedly failed in flight, while the other was intercepted.

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The attempted strike has raised concerns about Iran's missile range, as Diego Garcia is roughly 2,485 miles from Iran.

Iranian Foreign Minister Seyed Abbas Araghchi had warned Britain against supporting U.S. or Israeli military action, saying such involvement could further escalate the conflict.

Araghchi told U.K. Home Secretary Yvette Cooper that Iran views Britain's decision to allow U.S. forces to use its bases as "participation in aggression," according to his account of the call, the BBC reported.

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He also criticized what he described as the U.K.'s "negative and biased" approach and demanded that it cease cooperation with the United States.

The U.K. did not allow the U.S. to use its bases for initial offensive strikes against Iran but later granted permission for defensive operations in response to Iranian missile threats.

Downing Street said: "We didn't participate in the initial strikes, and we're not getting drawn into the wider war."

Tehran has said it would exercise what it calls its right to self-defense if threatened.

Meanwhile, the U.K. Ministry of Defence said Sunday that Royal Air Force assets, including Typhoon jets, remain engaged in defensive operations in the region.

The ministry added that British forces have helped counter Iranian drone threats while coordinating closely with allies.

Fox News Digital has reached out to the U.K. Ministry of Defence for comment.