The Defence Industries Organisation, quoted by Iran's state news agency IRNA, said the fire broke out at the plant yesterday night but it gave no further details.
Several arms facilities and military bases are located east of the Iranian capital, including Parchin which UN nuclear inspectors have been seeking to visit to answer concerns about Iran's atomic programme.
The base lies at the centre of allegations of past Iranian research into sophisticated explosives that can be used to detonate a nuclear warhead.
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