"No civil nuclear programme can explain the Iranian nuclear programme. It is a clandestine military nuclear programme," he said. "The international community has sent a very strong message to the Iranians - show reason, suspend all nuclear activities and uranium enrichment. And they're not listening to us."
BBC diplomatic correspondent Jonathan Marcus says that Mr Douste-Blazy's blunt characterisation shows that, in diplomatic terms at least, the gloves are coming off. France, the UK and Germany have had a key role in pursuing long-running contact with Tehran, in an effort to persuade it to give up its plans. But the mood among the Europeans is sombre, laced with an element of frustration, our correspondent says - as Iran now appears intent on pursuing its nuclear research programme.