Pakistani Prime Minister Shehbaz Sharif on Sunday condemned the Houthi attack on King Khalid International Airport in Riyadh, calling it a “red line,” according to Arab News.

The General Authority of Civil Aviation confirmed that 12 people died and more than 300 were injured, adding that some of the injured were in critical condition.

Sharif’s response came a day after the Iran-backed Houthis struck the airport. He said Islamabad would cooperate with the Kingdom “in every possible way.”