Why is there fighting in Yemen and what does it mean for the Iran war?

By Nadeen Ebrahim, Anna Cooban, CNN (CNN) — The Middle East war is widening as Yemen’s Iran-backed Houthi rebels launch a spate of attacks on United States’ allies and close yet another key shipping waterway. One of the strongest Iran-backed militias in the region, the Houthis entered the war in March, a month after Israel