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An Iranian court has indicted two Americans and two other dual nationals being held in the Islamic republic, the judiciary's official news website Mizan reported on Monday.

"After the issuance of indictments, the cases against (British-Iranian) Nazanin Zaghari-Ratcliffe, (American-Iranian) Siamak Namazi, (Canadian-Iranian) Homa Hoodfar and (U.S.-Lebanese) Nizar Zekka ... have been referred to court for processing," Mizan quoted Tehran prosecutor Abbas Jafari Dolatabadi as saying on Monday.

He did not provide details about the charges brought against the four. Dolatabadi also did not say whether the court was a Revolutionary Court, which handles security-related cases.

Iranian-American businessman Siamak Namaz. Ahmad Kiarostami / Reuters

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The State Department confirmed that it had seen the reports of "unspecified indictments" against "Siamak Namazi and a U.S.-legal permanent resident named Nizar Zakka as well as other non-U.S. citizen dual nationals."

"We continue to believe that if the reports are true, both are being unjustly detained and should be released as soon as possible," State Department spokesman John Kirby said at a briefing on Monday.

Related: Iran Frees Long-Held Washington Post Reporter

Iran does not recognize dual nationality and treats detainees only as Iranian, depriving them of consular access.

Siamak Namazi, a Dubai-based businessman who is a dual U.S.-Iranian citizen, was detained last October while in Iran visiting his family.

Dolatabadi did not mention the case of Namazi's 80-year-old father, Baquer Namazi, another dual American-Iranian national who his family said was detained in February, Reuters added. The Iranian authorities have not confirmed the elder Namazi's detention.

Zaghari-Ratcliffe, 37, a program coordinator with the London-based charity Thomson Reuters Foundation, was detained in early April before boarding a flight back to Britain with her two-year-old daughter. Her British husband, Richard Ratcliffe, says their daughter has been put in the care of Zaghari-Ratcliffe's family in Iran.

Nazanin Zaghari-Ratcliffe with her daughter Gabriella in London on June 10, 2016. Free Nazanin campaign / Free Nazanin campaign via AFP - Getty Images

Iran's elite Revolutionary Guards Corps (IRGC) accused Zaghari-Ratcliffe in a statement published last month of trying to "overthrow" the government, Reuters reported. Her husband has dismissed the accusation, it added.

On January 16, Washington Post reporter Jason Rezaian was released on after more than 500 days in Iranian captivity along with three other Americans in a major diplomatic breakthrough.