Saudi Arabia’s energy minister vowed a “serious” response to Houthi attacks on the kingdom’s airports and oil and gas facilities, according to BBC News.

On Sunday, a Pakistani man was killed in an attack on a terminal at the capital’s King Khalid International Airport, a day after a Houthi missile hit another terminal, killing 12 people and forcing its closure, Saudi authorities said; the toll rose to 13 after an injured Indian national died, according to the Indian embassy. With attacks on Saudi Arabia and on oil tankers near the Strait of Hormuz back at the center of supply concerns, oil climbed to its highest levels in nearly two weeks on Monday morning, according to OilPrice.com.