the International Atomic Energy Agency official says extending deadline is an option . Iranian foreign minister is heading to France for the talks , state media report . Russian agency cites unidentified official as saying deal `` impossible '' before deadline . The head of the International Atomic Energy Agency , who is not part of the Vienna talks , said Thursday that Iranian authorities are continuing to deny his agency access to a sensitive military complex suspected of being a site of nuclear activities . Both sides appear to leave open the possibility of a further extension beyond Thursday .
the International Atomic Energy Agency official says extending deadline is an option . Iranian foreign minister is heading to France for the talks , state media report . Russian agency cites unidentified official as saying deal `` impossible '' before deadline . Both sides appear to leave open the possibility of a further extension beyond Thursday .