Saudi forces and Yemen's Houthi militia traded heavy artillery fire which blew up part of the main border crossing between the two countries overnight, residents said on Sunday, an escalation of the two-month war. The Haradh border crossing, the largest for passengers and goods between the world's top oil exporter, Saudi Arabia, and its impoverished neighbor, was evacuated amid shelling which razed its departure lounge and passport section, witnesses said. Saudi Arabia has led an Arab coalition bombing the Houthis and backing southern Yemeni fighters opposing the group and loyal to the exiled government in Saudi Arabia headed by President Abd-Rabbu Mansour Hadi.
Saudi Arabia's King Salman said on Sunday he was "heartbroken" over a suicide bombing at a Shi'ite mosque in the kingdom that killed 21 people, state news agency SPA reported, a conciliatory statement as sectarian strife intensifies in the region. Salman said anyone linked to the attack, claimed by the Islamist militant group Islamic State, or who sympathises with it, will be brought to justice. The bombing in Saudi Arabia came as tensions between Sunni and Shi'ite Muslims are on the increase in the region.