Iran is to launch missiles later as part of a military exercise despite US sanctions.
The White House says Iran has conducted a ballistic missile test and the US is studying the details.
Hundreds of thousands of mourners flooded the streets of Tehran today, beating their chests and wailing in grief for late Iranian leader Akbar Hashemi Rafsanjani, who died over the weekend at the age of 82.
Iran has begun building its second nuclear power plant with Russian help, the first such project since last year's landmark nuclear deal with world powers.
Iran's foreign ministry has reacted angrily to UN criticism of the country's execution of 20 Kurdish militants earlier this month.