CNN did not review the intelligence for which the US assessment was made. The US government has provided no evidence that there are hidden rockets and other ammunition on board.
The carriers have been modified, the official said that the areas of their large decks have been removed. Officials did not explain why these ships would need to be replaced so that they could carry rockets.
The latter monitoring has shown that some of these cargo transports to and from Iranian ports have been included in recent days.
At the same time, two US officials said that during the last two weeks, Iranian naval forces have significantly increased their presence in the Hormuz Strait.
The Pentagon refused to comment on the assessment
Recent leaking US intelligence reports on the threat posed by Iran have led to discussions in Washington on whether Iran is planning to attack US assets or whether it is working to defend US action.
CNN previously reported that small Iranian boats, known as dhows, transported rockets around the Persian Gulf.
Two officials, who talked about the increased presence of the Iranian Navy, said there were also Iranian Revolutionary Guard Corps forces. Short administration in April Appointed IRGC as a Foreign Terrorist
Officials said there is no evidence that Iranian warships in this area carry out normal naval activities. They said the movements did not reflect the typical Iranian model of rocket transportation outside the Persian Gulf to Iran-backed forces in Yemen.
There is also growing concern that Iranians have significantly improved their ability to use drones, which could give them more information about where US forces are located. They added that this increased capacity might allow Iran to target the US more accurately
Critics are skeptical about US intelligence claims after 2003. The Iraq war, which was justified on the basis of the now discredited intelligence that Iraq has weapons of mass destruction.