TEHRAN — A prominent American-born journalist working for an Iranian state-run satellite television channel has been arrested in the United States, the broadcaster said Wednesday.

The reported action, which has not been confirmed by the American authorities, was condemned by Iranian officials. The journalist, Marzieh Hashemi, who has lived in Iran since 2009, is an anchor at the channel, Press TV.

It said that Ms. Hashemi, 59, was arrested at the St. Louis airport on Sunday and transferred by the F.B.I. to Washington, where she remained in custody. No charges have been filed against her, the channel said.

Foreign Minister Mohammad Javad Zarif of Iran was quick to denounce the reported arrest of Ms. Hashemi.