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Tehran: A major fire broke out at Iran's Evin prison which left at least four people dead and 61 others injured, media reports said.
Sources inside the prison - which is known for housing political prisoners - have told BBC Persian the number of casualties is higher.
Some videos shared on social media showed smoke coming out from the prison.
The fire incident occurred at a time when the nation is witnessing several anti-government protests.
Speaking from inside the prison, Tehran's governor told state TV that there was a riot in a wing of the prison housing petty criminals, reports BBC.