Iran displayed what it described as a domestically built long-range, surface-to-air missile air defence system on Thursday.
The decision to include Treasury Secretary Mnuchin in the sanctions, the source said, is peculiar, particularly in light of a series of stories identifying him as working behind the scenes to preserve the Iran nuclear deal and minimize sanctions on Iran.
Iran has blacklisted the US-based think tank Foundation for Defense of Democracies and its chief Mark Dubowitz on accusations of being behind "economic terrorism" against the Islamic Republic.
Since the exit, the US has reimposed punishing sanctions on Iran, including measures aimed at slashing its oil exports to zero, as part of a campaign aimed at pressuring Tehran. "He urges all Americans to do the same, especially since interacting with Iran's economy in any way carries significant sanctions risk, including some sanctions that he's personally helped author and more that he intends to introduce in the near future".
The tanker's detention and later released by Gibraltar has fuelled the growing tensions between Iran and the U.S. after President Donald Trump unilaterally withdrew America from Iran's 2015 nuclear deal with world powers over a year ago.
The US claims the tanker is controlled through a network of front companies by Iran's Revolutionary Guards, which are the target of its sanctions and have been designated a terrorist organisation, the Guardian reported.
The semi-official Tasnim news agency, which is close to the Guard, said Gen. Hossein Salami told a group of clerics Saturday about the missile test a day earlier. "And yesterday was one of the succesful days for this nation".
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The defense system has two search and intercept radars, which can resist electronic warfare and electromagnetic bombs, the report said.
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Since 1992, Iran has developed a homegrown defense industry.
The ship-tracking website MarineTraffic.com showed the tanker carrying 2.1 million barrels of Iranian crude oil worth some $130 million (€115 million) is now south of Sicily and has updated its listed destination as the port of Mersin in southern Turkey.
The Adrian Darya-1, formerly called Grace 1, was released from detention off Gibraltar after a five-week standoff over whether it was carrying Iranian oil to Syria in violation of European Union sanctions in mid-August, Reuters said.
Sailors can put in any destination into Automatic Identification System.
Last year, US President Donald Trump pulled out of an global agreement on Iran's nuclear programme and stepped up sanctions on Tehran in order to curb its development of ballistic missiles and its support for proxies in Syria, Yemen, Lebanon and Iraq.
The ship-tracking website MarineTraffic.com showed the Adrian Darya's position as just south of Sicily in the Mediterranean Sea.
The U.S. has a warrant in federal court to seize the ship and has been warning nations not to accept it.