The Houthi military spokesman reiterated the group’s warning to airline companies and airports in Saudi Arabia, and warned employees at the country’s oil facilities to avoid being present in places that the Houthis have announced as targets for attack.

At the same time, Reuters reported, citing witnesses, that smoke rose from an aircraft at King Khalid Airport in Riyadh, and, citing three informed sources, said that the aircraft was likely empty of passengers when the incident occurred.