The US has launched a fresh wave of strikes against Iran in response to Tehran's targeting of American troops and commercial ships in the Strait of Hormuz, sending oil prices higher as the conflict escalates. American forces attacked Islamic Revolutionary Guard Corps targets on Tuesday, marking the second round of US strikes in three days after a month of relative calm. US President Donald Trump said the strikes were in retaliation for Iran's failed sea mine attempt in the Strait and missile attacks against a US military base in Jordan, adding that if Tehran hits back, 'they will be hit again at a much harder and higher level'.