Diplomats say Iran and six world powers have started discussing a new proposal that would leave much of Tehran's uranium enriching machines in place but disconnected from feeds of uranium.

The talks are stalled over Iran's opposition to sharply reduce the size and output of centrifuges that can enrich uranium to levels needed for reactor fuel or weapons-grade nuclear missile material.

Two diplomats say the proposal would remove piping connecting enriching centrifuges, instead of focusing on cutting the 19,000 machines standing to only a fraction of that.

The New York Times reported Friday that Washington was considering changing tack and introducing the proposal. The diplomats told The AP Saturday that it was now on the negotiating table and Iran is cautiously receptive.

They demanded anonymity because their information is confidential.