Iran nuclear deal improbable by July 20, extension likely - diplomat

VIENNA (Reuters) - A deal on Iran's disputed nuclear programme is improbable by a July 20 deadline and talks between Tehran and six world powers are likely to be extended for some months, a Western diplomat said on Tuesday.

There was no immediate official comment from the parties involved in the negotiations - Iran, the United States, France, Russia, China, Britain and Germany. European Union foreign policy chief Catherine Ashton is coordinating talks with Iran on behalf of the six powers. "Given that ?it is highly improbable to finalise an agreement by Sunday, it would be highly probable that we will continue the talks in the coming months," the diplomat said, speaking on condition of anonymity.