The US administration in May withdrew from the 2015 nuclear deal with Iran, which eased sanctions on the Islamic Republic. It said restrictions on oil trade would be back by November 4 and urged foreign firms to phase out operations in Iran or face sanctions.
The US publication cited another source in the know who said the Swiss energy company was likely to scrap the agreement. A spokeswoman for the Group told the paper it complied with all international sanctions.
The US threat to go after foreign businesses in Iran has been harshly criticized in Europe. The European Union introduced a blocking statute to shield EU companies from the impact of US restrictions. Switzerland is not an EU member.