A Revolutionary Guards commander said on Saturday that Iran would use its missiles against enemies of the Islamic Republic if they threaten the country's security.

"We are working day and night to protect Iran's security. If we see smallest misstep from the enemies, our roaring missiles will fall on their heads," head of Revolutionary Guards' aerospace unit, Brigadier General Amir Ali Hajizadeh was quoted as saying by Tasnim news agency.

Earlier Iran said it was carrying out a military exercise to test its missile and radar systems, a day after U.S. President Donald Trump's administration imposed sanctions on Tehran for a recent ballistic missile test.

Although tensions between Washington and Iran have risen, U.S. Defense Secretary Jim Mattis said on Saturday he was not considering raising the number of U.S. forces in the Middle East to address Iran's "misbehavior" at this time, but warned that the world would not ignore Iranian activities.

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