Washington (CNN)The United States is deploying the USS Abraham Lincoln Carrier Strike Group and a bomber task force to the Middle East in response to a "number of troubling and escalatory indications and warnings" from Iran, US national security adviser John Bolton said Sunday.
A US official with direct knowledge of the situation told CNN the threats were against both US maritime and land-based forces in the region. The deployments are aimed specifically at deterring any Iranian military actions, the official added.
In a written statement released by the White House, Bolton said the US was deploying the USS Abraham Lincoln Carrier Strike Group and a bomber task force to the US Central Command region in the Middle East "to send a clear and unmistakable message to the Iranian regime that any attack on United States interests or on those of our allies will be met with unrelenting force."
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"The United States is not seeking war with the Iranian regime, but we are fully prepared to respond to any attack, whether by proxy, the Islamic Revolutionary Guard Corps, or regular Iranian forces," the statement continued.
Two US officials told CNN that the very public statements are aimed at deterring Iran. There is no indication any action by Iran is imminent.
In comments made Sunday night, US Secretary of State Mike Pompeo said the deployments have been in the works for "a little while."
The guided-missile destroyer USS Bainbridge, right, and the USS Abraham Lincoln transit the Strait of Gibraltar, entering the Mediterranean Sea, in April.
"We will hold the Iranians accountable for attacks on American interests. And the fact that ... if those actions take place, if they do by some third-party proxy, a Shiite militia group, the Houthis or Hezbollah, we will hold the Iranian leadership directly accountable for that," said Pompeo.
The US announcement comes on the heels several recent events that have increased US-Iran tensions, said Nishank Motwani, a visiting fellow at the Asia-Pacific College of Diplomacy in Australia.
Those include the US designating Iran's Islamic Revolutionary Guard Corps, Tehran's most powerful military institution, a terrorist organization, and Iran responding with the same designation for the US military's Central Command, which oversees the Middle East region; and the US eliminating waivers for some countries to buy Iranian oil and avoid US sanctions, Motwani said.
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On the oil issue, Iranian Foreign Minister Javad Zarif said two weeks ago that Iran would continue to sell its oil on world markets and the US should not try to stop it.
"If the United States takes the crazy measure of trying to prevent us from doing that," Zarif said, "then it should be prepared for the consequences."
US security officials at that time expressed concern that Tehran could respond asymmetrically by targeting US facilities and personnel around the Middle East.
But Motwani said that would be a bad idea for Tehran.
"I don't think it's in Iran's interest to escalate tensions. It would give the US a reason to take on Iran," he said.
And that might cause Iran to lose support its trying to maintain among European countries who have stuck to the Iran nuclear deal that US President Donald Trump abandoned.
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Zarif, the Iranian foreign minister, said two weeks ago that he believes some members of the Trump administration, but not Trump himself, and some US allies seek a confrontation with Tehran.
Zarif pointed to Israeli Prime Minister Benjamin Netanyahu, Bolton, the crown prince of the United Arab Emirates, Mohamed bin Zayed, and the crown prince of Saudi Arabia, Mohammed bin Salman -- dubbing them "the B Team."
"The B Team is pushing US policy toward a disaster," Zarif said
"It is not a crisis yet, but it is a dangerous situation. Accidents, plotted accidents, are possible. I wouldn't discount the B team plotting an accident anywhere in the region particularly as we get closer to the election," Zarif said.
Motwani noted that Monday's announcement of the US carrier and bomber deployments came first from Bolton, who has pushed a hardline policy toward Iran.
"The language is stronger, and part of it has to do with the hawkish stance of this administration," Motwani said.
A US official said acting Secretary of Defense Patrick Shanahan approved the deployments on Sunday because of "clear indications that Iranian and Iranian proxy forces are making preparations to possibly attack US forces in the region (Middle East)."
However, it is routine for the Pentagon to move forces in and out of the Middle East region.
For instance, the US Air Force pulled B-1 bombers from an airbase in Qatar in March after six-month deployment, according to the website of Dyess Air Force Base in Texas, to which the bombers returned.
Four US Air Force F-35As taxi after landing at Al Dhafra Air Base, United Arab Emirates, on April 15, 2019.
And the US Navy has been without an aircraft carrier in the Persian Gulf since early April, when the USS John C. Stennis Carrier Strike Group departed to head to the Mediterranean for exercises with the Lincoln Carrier Strike Group, according to the US Naval Institute's Fleet and Marine Tracker.
But a future carrier movement to the Persian Gulf was likely, and the Lincoln's move may just be that accelerated.
When the Lincoln and Stennis were in the Mediterranean, it was the first time two carriers operated in that body of water since 2016, and US officials portrayed it at the time as a show of US resolve toward Russia.
Also in the Lincoln strike group are the cruiser USS Leyte Gulf and the guided-missile destroyers USS Bainbridge, USS Mason and USS Nitze, according to a Navy release from early April, which also said a Spanish destroyer would be operating with the strike group for its entire deployment.
Other US deployments in the region include the amphibious assault ship USS Kearsarge and its escorts, which were in the Persian Gulf as of April 29, according to the USNI tracker.
And the Air Force has sent two squadrons of F-35A stealth fighters to the United Arab Emirates in the past month. In late April, those planes saw their first combat, striking ISIS targets in Iraq.
This story has been updated.
