Iranian vendor
Iranian vendor Ramin Naderi, center, prepares his walnuts to sell in Tehran's old main bazaar, Iran, Monday, Jan. 20, 2014. Photo by AP
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AP
Iranian Foreign Minister Javad Zarif speaking at the World Economic Forum in Davos. Photo by AP

A top U.S. Treasury official advised companies on Monday to "hold off" doing business in Iran because many of the sanctions against the country are still in place, despite the interim nuclear deal.

Speaking in Turkey, which is looking to expand business opportunities with its neighbor Iran, U.S. Under Secretary for Terrorism and Financial Intelligence David Cohen said that a significant portion of sanctions against Iran remained, including in the banking, energy and shipping sectors.

"Iran is not open for business," Cohen said. "Businesses interested in engaging in Iran really should hold off. The day may come when Iran is open for business, but the day is not today."

The United States and European Union partially lifted economic sanctions on Iran last week, after it unplugged banks of centrifuges involved in its most sensitive uranium enrichment work. The move was part of a deal aimed at easing concerns over Iran's nuclear program.

Turkey has expressed hopes that the easing of sanctions against Iran will open business opportunities, especially in the energy sector. Turkish Prime Minister Recep Tayyip Erdogan is due to travel to Iran on Tuesday.

Turkey imports gas and oil from Iran but the Turkish oil refiner, Tupras, was forced to reduce its Iranian oil purchases due to the sanctions.

"What we are working toward is the possibility of a long-term, comprehensive resolution with the Iranians, in which they demonstrate that their nuclear program is exclusively for peaceful purposes," Cohen said.

Cohen also said he expects Turkey's state-run banking institution, Halkbank, to continue processing oil payments to Iran. The bank's head was arrested last month on bribery charges and police seized $4 million in cash in shoe boxes from his home.