Iran's military warned U.S. forces in Iraq that U.S. helicopters had been spotted flying close to the Iranian border and that Tehran would respond to any violation of its airspace, state radio reported on Wednesday.
"In the statement, it says recently it has been seen that American army helicopters were flying a small distance from Iraq's border with Iran and, because of the closeness to the border, the danger of them violating Iran's border is possible ... Iran's armed forces will respond to any violation," radio quoted a statement from the armed forces headquarters as saying, reported Reuters.