Pittsburgh, Sep 25 (DPA) US President Barack Obama said Friday the size of a second Iranian nuclear plant revealed this week is 'inconsistent' with claims that it is being used to produce civilian nuclear power.

Speaking at the G20 summit and standing alongside British Prime Minister Gordon Brown and French President Nicolas Sarkozy, Obama said the 'disturbing' news of the second facility demonstrates Tehran's willingness to deceive the world and violate international norms.

'The existence of this facility underscores Iran's continued unwillingness to meet its obligations under UN Security Council resolutions,' Obama said.

'It is time for Iran to act immediately to restore the confidence of the international community by fulfilling its international obligations,' he added.