A picture take on Sept. 14, 2017 shows an Airbus A340 of Mahan Air at the tarmac at Dubai's International Airport. (Xinhua/AFP)

WASHINGTON, Sept. 14 (Xinhua) -- The U.S. Treasury announced on Friday that it has imposed sanctions on a Thailand-based aviation company, punishing it for its alleged ties with an already designated Iranian airline.

The new move slapped sanctions on My Aviation Company for "acting for or on behalf of Mahan Air, an Iranian airline previously designated for supporting Iran's terrorism activities," said the Treasury in a statement.

The latest move by the department will freeze all the assets the designated entity may hold in the United States and generally prohibit U.S. individuals from doing business with it.

Washington has intensified its sanctions against Iranian entities and individuals after President Donald Trump's decision to exit the Iran nuclear deal in May, a move that has been criticized widely by the international community.

The first unilateral U.S. sanctions on Iran's automotive sector, gold trade, and other industries were re-imposed in early August, with further sanctions on oil and transactions with the Central Bank of Iran expected in November.

A UN expert in late August called the sanctions re-imposed on Iran as "unjust and harmful," saying that the sanctions are driving millions of people into poverty and making imported goods unaffordable.