Russian shipment for Iranian nuclear plant blocked

She could not give any further details about the precise nature of the equipment.

The United States and Russia have said the supply of Russian nuclear fuel means Iran has no need to continue its own uranium enrichment program a process that can provide fuel for a reactor or fissile material for a bomb.

Iran has insisted it will continue enriching uranium, saying it needs to provide fuel to another 300-megawatt light-water reactor it is building.

Doubts remain about Iran's intentions. The European Union last week asked Iran to open its secretive program to greater international scrutiny by joining a treaty that would let the U.S. and other nations review Bushehr's safety.