(Bloomberg) -- President Donald Trump says he has ordered the U.S. Navy to destroy any Iranian gun boats that harass American ships at sea.

Trump issued the warning in a tweet sent from his iPhone Wednesday morning. It comes after 11 gunboats from Iran’s Islamic Revolutionary Guard Corps crossed the bows and sterns of American ships at close range last week.

U.S. Central Command called the Iranian maneuvers “dangerous and provocative actions” in a statement last week, and said at the time that that U.S. commanders on the scene “retain the inherent right to act in self-defense.”

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