But the attack on Jordan, where three American soldiers were killed this month, could mark a shift in strategy, experts say. US President Donald Trump angrily warned Iran that US forces will strike back. During the preceding two weeks, the United States had conducted daily air strikes on Iran, which retaliated by hitting American bases dotted across the Middle East. Fears Of A Widening WarHours after Iran’s attack on US bases in Jordan, the United States and its ally Saudi Arabia launched joint air strikes against Iran-backed armed groups in Iraq. The attacks by Iran and the United States have raised fears of a widening war and chaos in international energy markets.