The US Treasury Department has imposed sanctions on Karnakis and Karnakis, a law firm based in Greece and Panama, alleging that it had provided legal assistance to Iranian shipping networks for years, Reuters reports.

The US Financial Crimes Enforcement Network (FINCEN) also issued an administrative subpoena to advance an investigation into a Greek bank over potential ties to Iran, according to a US Treasury statement, which has not named the bank.

FINCEN has also issued requests for information to six other European banks that it did not name over relationships with Iranian financial institutions under US sanctions.

“Whether you are conducting illegal oil transfers at sea or sitting in the corner office of a law firm, if you are supporting the Iranian regime, we will find you and sanction you,” US Treasury Secretary Scott Bessent says in a press release.

Treasury has also imposed sanctions on shipping agents based in Singapore and the United Arab Emirates that it claims aid Iranian shadow fleet operations directly.

Karnakis and Karnakis have not immediately responded to a request for comment.