WASHINGTON (Reuters) - The United States on Wednesday said it had imposed sanctions on a subsidiary of the Central Bank of Iran (CBI), along with two entities based in the United Arab Emirates, one in Turkey and on three individuals for smuggling U.S. technology to the CBI.

"These designations target three individuals and four entities tied to the procurement of sophisticated U.S. technology for use by CBI in violation of U.S. export restrictions and sanctions," the Treasury Department said.

In a statement, the Treasury noted the CBI is itself already under sanction for providing financial support to Iran's Islamic Revolutionary Guard Corps's Quds Force (IRGC-QF), an elite arm which carries out overseas operations, and on Hezbollah, a powerful Iranian-backed armed and political force in Lebanon.

The sanctions represent Washington's latest efforts to punish Tehran, whose proxies in Iraq, Lebanon, Syria, Yemen and the Gaza Strip have attacked U.S. and Israeli targets.

It identified the three individuals as ISC Chief Executive Seyed Abotaleb Najafi; Freedom Star President Mohammad Reza Khademi; and ISC employee Pouria Mirdamadi, a dual French and Iranian national it said was involved in Ted's operations.

"The Central Bank of Iran has played a critical role in providing financial support to the IRGC-QF and Hezbollah, two key actors intent on further destabilizing the Middle East," Under Secretary of the Treasury for Terrorism and Financial Intelligence Brian Nelson said in the statement.

As a result of the steps, all property of those sanctioned that is in the United States or falls under the control of U.S. persons is blocked. In general U.S. regulations bar U.S. persons from transactions involving property of those sanctioned.

(Reporting by Kanishka Singh in Washington and Arshad Mohammed in Saint Paul, Minn.; Editing by Chris Reese)