Yemen's Houthis late Thursday wounded 11 people in an attack on southern Saudi Arabia, a Riyadh-led coalition said, the highest toll in the kingdom from an attack by the rebels in years.

The attacks come as Yemen is increasingly drawn into the U.S.-Israeli war with Iran, with the rebels stepping up attacks against both Yemen government forces and neighboring Saudi Arabia, a key U.S. ally and supporter of the internationally recognized Yemeni government.