Mortars and long-range rockets blasted cars and punched holes in buildings in the southern Saudi Arabian city of Najran on Tuesday, a Saudi official said, underscoring the threat posed to the nation’s territory by the instability across its southern border in Yemen. The attack was the first significant offensive against a Saudi city since a Saudi-led campaign of airstrikes began in March against Yemen’s Iran-backed Houthi militants . A Saudi military official told state television that the Houthis were responsible, while three Houthi officials said local Yemeni tribesmen launched the attack in coordination with the Houthis. It wasn’t immediately clear who was responsible. As the shelling intensified, Saudi authorities took emergency steps. They […]