Two children amid the rubble of a house destroyed by a Saudi-led air strike in Sanaa, Aug. 11.

SANAA — Shells fired by Yemen’s Houthi group killed seven civilians in southern Saudi Arabia, Saudi state television reported, while an air strike by an Arab coalition destroyed a house east of the Yemeni capital,  killing nine family members, residents said.

Saudi Ekhbariyah television said projectiles fired by the Houthis landed at an industrial area in the southern city of Najran, close to the Yemeni border, in one of the deadliest attacks on Saudi Arabia.

The Saudi-led coalition said four Saudi citizens and three expatriate workers died. 

Earlier in the day, residents in Nehm area, east of Sanaa, said a plane from the Saudi-led alliance struck the home of a local leader of Yemen’s armed Houthi group while he was out, killing his father and eight members of the family.

Saudi Arabia and its mostly Gulf Arab allies intervened in Yemen’s civil war in March 2015 to restore President Abd-Rabu Mansour Hadi to power and fight off the Houthis.

The conflict has killed more than 6,500 people and unleashed a humanitarian crisis in one of the world’s poorest countries.

Medecins Sans Frontieres said an air strike on Monday hit one of its hospitals in  northwestern Hajja province, killed 11 people and wounded several others. The charity said in a statement on Tuesday that three of those who were wounded had died, raising the death toll to 14.