US Defense Secretary Robert Gates has revealed that Washington plans to engage in a number of 'exclusive' activities against Iran.

"We're being very aggressive in going after the networks in Iraq, and the individuals who are interfering or supplying weapons from Iran," said Gates Tuesday.

"We have a number of other activities under way. We take it very seriously. But at this point our activities are focused pretty exclusively inside Iraq,'' he added.

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He accused the Islamic Republic of arming Iraqi insurgents and claimed it had 'awakened them (the Iraqis) to the reality of the magnitude of Iranian meddling in Iraq.'

Washington accuses Tehran of destabilizing Iraq by 'funding, training, arming and directing' Iraqi insurgents.

Tehran has rejected the allegations, stating that 'foreign interference in Middle Eastern affairs' is the main reason behind regional violence.