Iran's judiciary spokesman has raised the possibility of a prisoner exchange involving two U.S.-Iranian citizens and an Iranian consultant to the U.N. arrested in the United States.

The semi-official ISNA news agency quoted Gholam Hossein Mohseni Ejehi as saying Sunday that he has "heard words from here and there though nothing has been officially conveyed to the judiciary."

Ejehi was asked about a possible exchange involving Siamak Namazi, jailed in Iran for "cooperation with the hostile government of the United States." His father, Baquer, is jailed on unannounced charges.

The consultant, Ahmad Sheikhzadeh, was arrested in March for sanctions violations.

Iran released five Americans in January, including a Washington Post journalist, after the U.S. dropped sentences, charges or warrants against 21 Iranians.

U.S. officials declined to comment on the report.