'USS Nimitz' ordered back to the Arabian Gulf 'to respond to any threat'

Decision follows recent reductions in troop numbers in the region, but US denies link to Iranian scientist's assassination

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  An MH-60S Sea Hawk helicopter conducts flight control checks on the flight deck of the US Navy aircraft carrier USS Nimitz in the Indian Ocean on November 25, 2020. Handout via REUTERS

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  The aircraft carrier USS Nimitz and the guided-missile cruiser USS Philippine Sea in formation during a Strait of Hormuz transit on September 18, 2020. AFP PHOTO / US NAVY

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  An image provided by Iran's Revolutionary Guard Corps (IRGC) reportedly shows the USS Nimitz Aircraft carrier prior to entering the Strait of Hormuz and the Gulf. AFP

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  USS Nimitz, the guided-missile cruiser USS Princeton and guided-missile destroyer USS Sterett transits the Strait of Hormuz on September 18, 2020. US NAVY / AFP

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  A US Navy helicopter descends to land aboard the USS Nimitz aircraft carrier while at sea on January 18, 2020 off the coast of Baja California, Mexico. Getty Images AFP

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  The aircraft carrier USS Nimitz transits the Strait of Hormuz on September 18, 2020. US NAVY / AFP

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  A US Navy catapult officer works on the flight deck of the USS Nimitz aircraft carrier while at sea on January 18, 2020 off the coast of Baja California, Mexico. Getty Images/AFP

The USS Nimitz, one of the largest warships in the world, was ordered back to the Arabian Gulf last week, days before the killing of a prominent Iranian nuclear scientist, the US Navy said.

The USS Nimitz follows the rapid deployment of US Air Force B-52H Stratofortresses to the Gulf last Sunday to deter aggression and preserve stability. The navy said the deployment of the aircraft carrier was not related to any specific threat but was intended to ensure stability while US forces were withdrawn from Iraq and Afghanistan.

"There are no specific threats that prompted the return of the Nimitz combat group," said Rebecca Rebarich, spokeswoman for the US Fifth Fleet, which is based in Bahrain, after the aircraft carrier was sent to the Gulf on Wednesday.

"This act ensures that we have sufficient capacity to respond to any threat, and to deter any opponent from moving against our forces during the drawdown," Ms Rebarich said.

"The return of Nimitz is centred on maintaining Centcom's ability to remain postured and prepared to help preserve regional stability and security," Ms Rebarich said, referring to the US Central Command.

The Pentagon said that they would provide combat support and air cover with the withdrawal of thousands of American soldiers from Iraq and Afghanistan in mid-January, ordered by President Donald Trump.

About 2,000 troops will be pulled from Afghanistan and 500 from Iraq, leaving about 2,500 in each country.

In early October, the USS Nimitz left the Gulf after nearly two months in the region to join Australia, India and Japan in scheduled exercises in the Arabian Sea.

The Fifth Fleet's Twitter account showed pictures of the Nimitz's air wing on flight operations there on Saturday.

Carrier groups typically include a cruiser, a destroyer squadron and an air wing.

The USS Nimitz-class carriers are more than 304 metres long, have a crew of more than 6,000, and carry up to 90 helicopters and fixed-wing aircraft.