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In an interview aired on Sunday on CNN, Mullen again accused Iran of trying to build nuclear weapons and said he does not believe "for one second that Iran's nuclear activities are peaceful."

"Iran is still very much on a path to be able to develop nuclear weapons," he added.

"We've actually been thinking about military options for a significant period of time. And I've spoken with many others, that we've had options on the table... And we will continue to do that in the future," the official said.

Earlier in November, US Republican Senator Lindsey Graham also urged Washington to launch a military attack on Iran.

Mullen's remarks come as US Secretary of Defense Robert Gates has earlier this month rejected the idea of any future military action against Iran, saying no strike can stop Tehran's nuclear program and diplomacy is the best way to resolve Iran's nuclear issue.

Mullen made the remarks following Iran's announcement that the Bushehr nuclear power plant in south of the country has started to generate electricity.