Negotiations on Iran's nuclear programme continue in Lausanne, Switzerland, after a deadline for a deal expired on Tuesday.
Russian and Iranian officials have reported progress in the talks.
World powers want Tehran to restrict its nuclear activities in exchange for an easing of sanctions.
Western officials say several issues remain unresolved but have expressed hope agreement can be reached on Wednesday.
Dr Mahjoob Zweiri, Iran expert at Qatar University, is less optimistic.
IN: "Actually….
OUT: ...serious issues."
DUR: 24 seconds
ALT:
Dr Mahjoob Zweiri, Iran expert at Qatar University, says there remain disagreements about how quickly sanctions should be removed.
IN: "The Western….
OUT: ...saying yes."
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