Several rallies have taken place at universities in the Iranian capital, Tehran, for the second day running.
"The negotiations continue and the possibility of reaching an interim agreement exists," the official said.
President Donald Trump said he is considering limited military strikes to pressure Iran into signing a new nuclear deal, but bombing the country may have the opposite effect, risking a new ...
Iran and the US renewed negotiations earlier this month to tackle their decades-long dispute over Tehran's nuclear programme.
Trump's envoy says US president has 'plenty of alternatives' to a deal; Iranian official says sides aren't on same page about ...