Under a plan detailed on July 9, the United States would provide coordinating ships and lead surveillance efforts while participants in the coalition patrolled nearby waters and escorted commercial vessels with their nation's flags.
MARAD said in at least two incidents involving commercial vessels and Iran since May 2019 ships had reported interference with their Global Positioning System and "spoofed" communications from unknown entities falsely claiming to be USA or other warships.
The warning was delivered in a statement that also cited an advisory from the Transportation Department's Maritime Administration.
The US Maritime Bureau has said that US vessels or other "allied nations" may perform maritime safety missions by sending a warning or other alerts or approaching merchant ships in the Persian Gulf and Hormuz Strait, the Oman Sea, and the Sea.
In remarks in 2016, Leader of the Islamic Revolution Ayatollah Seyed Ali Khamenei underlined that security of the Persian Gulf region comes within the purview of the regional countries alone, and dismissed the United States claim of seeking security in the region.
Israeli foreign minister Israel Katz said on August 7 that the regime would be part of the US-led coalition to "protect the security of the Persian Gulf".
Tensions between Washington and Tehran - Saudi Arabia's arch foe - have soared since US President Donald Trump pulled Washington out of a nuclear deal with Iran a year ago and imposed punishing sanctions.
Iranian Foreign Minister Mohammad Javad Zarif tweeted on Friday that any maritime presence in the Gulf from outside the region would be a "source of insecurity" for his country, and Tehran would act to safeguard its security.
The US and its Gulf allies have accused the Islamic Republic of the tanker attacks, which Tehran denies.
P&O Cruises has cancelled its cruises in the Persian Gulf over fears that its British ships could be potential targets for Iran's Revolutionary Guard. "What I'd like to see with Iran, I'd like to see them call me". "We're not looking to hurt Iran", Trump added.
The regional security is only guaranteed within the regional states' cooperation, Hatami was quoted as saying by the news agency on Thursday.
In one of the latest incidents in the Gulf, Iran seized a British-flagged oil tanker in what appears to be a retaliatory move after Gibraltar seized an Iranian oil tanker with the help of the UK Royal Marines at the beginning of July.
In a statement, Mousavi said Iran would view any support offered by Israel as a "clear threat to its security, sovereignty, and territorial integrity, and a crisis-provoking and destabilising element" in the region. The UK, however, later accepted to join the coalition.