Preet Bharara Preet Bharara

ISTANBUL — Turkish prosecutors launched an investigation Saturday of two U.S. prosecutors involved in putting a Turkish-Iranian businessman on trial for allegedly violating U.S. sanctions against Iran, according to Turkey's official news agency.

The Istanbul prosecutor's office said it is investigating Preet Bharara, the former U.S. attorney for the Southern District of New York, and Bharara's successor, acting U.S. Attorney Joon H. Kim.

A statement from the Istanbul prosecutor's office claimed that the sources of the documents and wiretaps being used as evidence in the U.S. case against gold trader Reza Zarrab were unknown and violated international and domestic laws.