SriLanka, Feb. 7 -- US President Donald Trump has signed an executive order threatening to impose additional tariffs on countries that continue to trade with Iran.

The order, issued on Friday, does not specify the rate that could be imposed, but uses 25% as an example. It says the tariff could apply to goods imported into the US from any nation that "directly or indirectly purchases, imports, or otherwise acquires any goods or services from Iran".

Trump has not directly commented on the order but reiterated "no nuclear weapons" for Iran when speaking from Air Force One on Friday night.

It comes as talks continue between senior US and Iranian officials in Oman, following several weeks of threats from both sides.

Trump threatened a 25% ...