The shooting down of a Ukrainian airliner in Iran in January was due to human error and not an order from senior military authorities, the military prosecutor for Tehran province, Gholam Abbas Torki, said .

There was no indication that the downing of the airliner, which killed all 176 people aboard, was due to a cyber attack on Iran's missile or air defence systems, Torki said, adding that three people were under arrest related to the accident.