Police in the Iranian capital, Tehran, have denied using live ammunition against protesters outraged by the shooting down of a Ukrainian airliner.
The Iranian Chief of Police however admitted that officers had been given orders to show restraint.
For the first three days after the crash, Iran denied that its armed forces had shot down the plane and suggested there had been a technical failure.
Videos posted online last Sunday recorded what appeared to be gunfire and also showed an injured woman being carried away.
Protests erupted last Saturday, after Iran admitted firing missiles by mistake at the Ukraine International Airlines jet that crashed near Tehran.
All 176 people on board flight PS752, mostly Iranians and Canadians, were killed.
The admission of responsibility, which came after video emerged of a missile appearing to hit the plane, provoked widespread anger in Iran against the establishment.