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BBC World Service.
This episode contains scenes of violence and descriptions that you may find upsetting.
Radio communications apparently from the middle of mass protests in Iran at the start of this year.
This appears to be members of Iran's security forces in the city of Isfahan calling for reinforcements.
We've translated what they say.
They're asking
for help to contain the demonstrations that erupted right across the nation back in January.
There are now Iranians from all walks of life,
marching through the streets, calling for change in all corners of the country.