The defeated Iranian presidential candidate, Mir Hossein Mousavi, has said he will keep challenging the election result.
But the number of people on the streets has been considerably smaller than in past demonstrations, and a planned day of mourning was cancelled.
Restrictions have been placed on the BBC and other foreign news organisations in Iran. Reporters are not allowed to cover unauthorised gatherings or move around freely but there are no controls over what they can say.
Jeremy Bowen reports from Tehran.