Yemen’s army says its drones have hit targets in southwestern Saudi Arabia, following warnings that retaliatory attacks would hit deep in Saudi territory if the kingdom did not stop its aggression against the impoverished nation.

The spokesman for Yemen’s Armed Forces, Brigadier General Yahya Saree, said in a tweet that the Yemeni Air Force had conducted “a massive operation” on the southwestern cities of Khamis Mushait and Najran at noon on Friday.

He said that the military used Qassif K2 drones in the operation.

The spokesman added that “the control room of Najran airport, and weapons warehouses in King Khalid air base in Khamis Mushait, and other military positions” had been targeted in the attack.

Saree on Thursday emphasized that legitimate retaliatory attacks would continue as long as the Riyadh regime and its allies pressed ahead with their war on and blockade of Yemen.