The report today by the semi-official Fars news agency quotes a district governor, Ezzatollah Khammohammadi, as saying that rescue teams have rushed to the crash site in the mountains north of the Iranian capital.
He says the cause of the crash is not immediately known and that an investigation is underway.
The report did not identify the victims or give the type of helicopter involved. Iran's military has both American and Russian-made helicopters in service.