Iran and key world powers have begun a second day of talks over Tehran's disputed nuclear programme.
The first day of talks in Geneva lasted nearly 10 hours and were described as "constructive" and "forward moving" by an Iranian official.
A Western source also said Monday's talks were held "in a good atmosphere".
Iran said on Sunday it had delivered its first domestically produced raw uranium and would go into the talks with "strength and power".
Western powers fear Tehran may be trying to produce a nuclear weapon, but Tehran says its programme is purely peaceful.
An unnamed Iranian official, quoted by Reuters, said Tuesday's talks would "fix the framework for future discussions during which we could talk about nuclear disarmament and about co-operation in the civil nuclear domain".
"The [nuclear] right of Iran will not be discussed. If we agree on a framework, we could have several sessions of negotiations," he said. BBC News
