Saudi Arabia destroyed three explosives-laden drones fired towards civilian populations in the kingdom’s southern cities of Jazan and Khamis Mushait, state media reported on Friday.

The Saudi-led coalition fighting to restore the internationally recognised Yemeni government said they foiled the latest in an increasing number of attacks by the Iran-backed Houthi rebels over the border.

“We take all necessary measures to protect civilians, in accordance with humanitarian law,” the coalition said on Friday.

A top US commander said the Houthi rebels had launched more than 150 ballistic missiles against Saudi Arabia since the start of the year.

Saudi Arabia’s Cabinet said Iran must engage in negotiations to avoid escalation and regional tension.