Yemen's Houthi rebels joined the war with attacks on Saudi Arabia and Israel, causing US military injuries.

At least 15 U.S. military personnel were wounded in an Iranian attack on Saudi Arabia and Yemen's Houthi rebels entered the war with an attack on Israel. <p>At least 15 U.S. military personnel were wounded in an Iranian attack on Saudi Arabia and Yemen's Houthi rebels entered the war with an attack on Israel.</p><img src="https://media.npr.org/include/images/tracking/npr-rss-pixel.png?story=nx-s1-5763013" />