The official IRNA news agency said Wednesday's blast happened in the basement of a building in the heart of the bazaar, which was packed with people shopping ahead of the Iranian new year.
The semi-official ISNA news agency says some of the injured are in serious condition. It says the incident took place in a gold workshop.
Police blocked off roads in and around the market to help first responders, who had to make their way through the historic bazaar's vast labyrinth of alleys.
By AP
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