Video footage has emerged showing what appears to be Iranian security forces shooting at fleeing people with a gun mounted on the back of a pick-up truck.
In the clip, which has been verified by the BBC Persian service, bangs can be heard as the vehicle chases people in Baneh, in Kurdistan province.
Kurdistan has seen a fierce crackdown since mass protests which have swept the nation began last month.
One human rights group says more than 200 people have been killed.
The number of fatalities or casualties is hard to verify since the BBC and other independent media are banned from reporting from inside Iran. Authorities have also heavily disrupted the internet.
Norway-based
Iran Human Rights organisation put the death toll at 201, including 23 children, as of Wednesday, though the true figure is believed to be higher.
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