Commerzbank will stop handling dollar transactions for Iran its its New York branch by the end of this month, the spokesman said, confirming a corresponding report in the Wall Street Journal Europe on Wednesday.
But the German bank would continue to handle euro transactions for Iranian clients, he added.
A number of European banks, such as Credit Suisse and UBS, have already taken similar decisions, paring back or ceasing altogether their operations with Iran.
The US says Iran’s state-controlled banks support terrorism and Washington is also seeking to financially quarantine Iran because of Teheran’s vows to press ahead with its nuclear programme in defiance of international will.