■ Turkish prosecutors launched an investigation of two U.S. prosecutors.

ISTANBUL — Turkish prosecutors launched an investigation Saturday of two United States 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.

Turkey’s official Anadolu Agency published the statement Saturday. The U.S. Attorney’s Office for the Southern District of New York declined to comment.

Zarrab, 34, has been charged in the U.S. for allegedly evading sanctions on Iran. An executive of Turkey’s state-owned bank, Halkbank, also faces charges and is due to appear in court Nov. 27 in New York.

Former Turkish Economy Minister Zafer Caglayan is also among the nine defendants.

Turkish officials allege the case is politically motivated. They have accused Bharara, the former U.S. attorney, of links to a Pennsylvania-based Muslim cleric, Fethullah Gulen, whom the Turkish government blames for a failed July 2016 military coup.

Bharara vehemently has rejected the allegation. Gulen denies involvement in the coup attempt.

Reza Zarrab