As Israel continues its military operation in Gaza, Yemen’s Iran-backed Houthi rebels are stepping up their strikes on ships in the Red Sea in retaliation. A senior US military official says the breadth of attacks has not been seen in at least “two generations.” In this episode, CNN’s Katie Bo Lillis explains why the Houthis are targeting ships and how the attacks could continue to snarl worldwide shipping and commerce. Learn more about your ad choices. Visit megaphone.fm/adchoices