Iran nuclear talks set to go beyond deadline as differences remain

By Parisa Hafezi and John Irish VIENNA (Reuters) - The six world powers seeking to negotiate an historic agreement with Iran to curb its nuclear program plan to carry on negotiating beyond a Tuesday deadline, a senior U.S. official said on Sunday. Iranian Foreign Minister Mohammad Javad Zarif was to leave Vienna and return to Tehran for consultations with the country's leadership on the state of negotiations, Iran said. Officials from both sides said big differences still remained. ...