NEW ORLEANS (AP) — A prominent American anchorwoman on Iranian state television has been arrested by the FBI during a visit to the U.S., the broadcaster reported Wednesday, and her son said she was being held in a prison, apparently as a material witness.

Marzieh Hashemi, who worked for the network's English-language service, was detained in St. Louis, where she had filmed a Black Lives Matter documentary after visiting relatives in the New Orleans area. She was then taken to Washington, according to her elder son, Hossein Hashemi.

The FBI said in an email that it had no comment on the arrest...