By Phil Stewart, Idrees Ali and Mohammed Ghobari WASHINGTON/ADEN, Yemen (Reuters) -The United States and Britain launched strikes from the air and sea against Houthi military targets in Yemen in response to the movement’s attacks on ships in the Red Sea, a dramatic regional widening of the Israel-Hamas war in Gaza. As witnesses in Yemen confirmed explosions throughout the country to Reuters, President Joe Biden cautioned in a statement late on Thursday he would not hesitate to take further action if needed. “These targeted strikes are a clear message that the United States and our partners wil…