Following the Houthis' attack on Saudi Arabia's airports and oil and gas facilities, the country's energy minister threatened the Houthis with a "serious" response. Prince Abdulaziz bin Salman said at the World Energy Summit in Riyadh: "The events of the last few weeks were serious. "Our response should be equally serious." Riyadh's international airport suspended almost all of its flights on Monday, the second day in a row and after three deadly attacks in recent days. Saudi Arabia announced that a Pakistani citizen was killed yesterday while being transferred to one of the Riyadh airport's terminals. Two days ago, a missile Houthis hit another terminal, killing 13 people and disabling this terminal. The Houthis said they carried out these attacks in response to the "barbaric aggression of Saudi Arabia" against the areas under their control in Yemen. The Ministry of Health announced that a child was killed and six others were injured in a Saudi airstrike on houses in the Yemeni capital. Read more: Reuters