US President Barack Obama has offered "a new beginning" of engagement with Tehran in an unprecedented direct video message to the Iranian people.
"My administration is now committed to diplomacy that addresses the full range of issues before us," Mr Obama said.
His message was released to coincide with the festival of Nowruz – when Iranians mark the arrival of spring.
Relations between Iran and the US have been strained over Tehran’s controversial nuclear activities.
The US fears Iran’s uranium enrichment programme is a cover to build atomic weapons, a charge Iranian officials deny.