"There are documents that show that Britain and America are supporting Rigi's terrorist group with arms and information," the radio quoted Ebrahim Raisi, first deputy to Iran's judiciary chief, as saying.
Shi'ite-dominated Iran said this month the Sunni group Jundollah (God's Soldiers) had killed 16 police hostages who were abducted from a checkpoint in the southeastern Sistan- Baluchestan province in June.
Iran has blamed Jundollah for other abductions and in 2007 the group claimed responsibility for an attack on a bus carrying Iranian Revolutionary Guards that killed 11 people.