Story highlights "As of today we are officially putting Iran on notice," Flynn said

Spicer added the US won't "sit by and not act"

Washington (CNN) President Donald Trump's National Security Advisor Michael Flynn condemned Wednesday Iran's recent ballistic missile test launch, calling it a "provocative" breach of a UN Security Council resolution.

Flynn called the launch the latest in a series of provocative moves by Iran that have included backing Houthi rebels in Yemen, who have attacked US allies.

"As of today, we are officially putting Iran on notice," Flynn said from the White House briefing room.

Flynn did not say whether the US would take action beyond a verbal warning, and three senior administration officials, speaking on background, said Wednesday that they are still in the early stages of determining what action the US should take in response.

"We are considering a whole range of options. We're in a deliberative process," one of the officials said.

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