Aug. 8 (Bloomberg) — The U.S. Treasury Department said its Office of Foreign Assets Control is investigating Standard Chartered Plc for "potential Iran-related violations as well as a broader set of potential sanctions violations."

OFAC, as the office is commonly referred to, "will continue to implement and enforce our sanctions vigorously," Adam Szubin, the office's director, said today in a letter to Second Permanent Secretary Tom Scholar at the U.K. Treasury. Szubin said OFAC will coordinate with "other federal and state agencies," including the New York State Department of Financial Services. OFAC enforces economic and trade punishments.

Standard Chartered might be asked to pay as much as $700 million to resolve money-laundering allegations filed by the head of the New York agency after his department grew impatient with inaction by federal regulators, a person familiar with the case said.