An American-born anchor for Iranian state television returned to Iran on Wednesday after being detained for 10 days in the U.S., Reuters reported.

Marzieh Hashemi was not charged during her 10-day detention but testified as a material witness in an undisclosed grand jury investigation in Washington. She was released last week.

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The details of the case are under seal, but Hashemi said it was not related to terrorism. She claimed that her arrest was unnecessary since she would have voluntarily cooperated with investigators.

Hashemi is a U.S. citizen born Melanie Franklin and has been a broadcaster for Press TV for 25 years. She was reportedly coming to the U.S. for a family reunion when she was detained.

While arrests of material witnesses are rare, Hashemi’s 10-day stretch is not unusual for such a detention. However, the arrest comes at a time of heightened tensions with Iran after it confirmed earlier this month it had arrested a U.S. citizen.

Iranian Foreign Ministry spokesman Bahram Ghasemi told Iranian state television that Hashemi’s detention is reflective of the Trump administration's “apartheid and racist policy."

“We hope that the innocent person will be released without any condition,” Ghasemi said at the time of the arrest.