Yemen's Tehran-backed Houthis attacked four cities in the south of U.S. ally Saudi Arabia on Tuesday, wounding more than 70 people and setting oil installations ablaze in what appeared to be a major expansion of the six-month-old Middle East war.The Houthis…<p><p>https://www.marinelink.com/news/injured-houthis-attack-four-saudi-cities-542808</p></p>