France joined the United States on Wednesday in rejecting Iran's response to an incentives package aimed at defusing a dispute over its nuclear program as insufficient as negotiators from six major world powers plotted their next move. France's Foreign Ministry said the Iranian reply did not provide any clarification to the central question of whether the country would agree to freeze its nuclear program. France regrets that Iran "has again chosen not to provide a clear response," Foreign Ministry spokesman Romain Nadal said in Paris. Senior diplomats from six nations that made the offer - Britain, China, France, Germany, Russia and the United States - and EU foreign policy chief Javier Solana were to hold a conference call Wednesday to discuss the way ahead, US and EU officials said. Iran on Tuesday had presented a one-page document to Solana. The US State Department deemed the reply unacceptable, making the prospect of new sanctions against the country more likely.