Saudi authorities said Wednesday that three people were killed in attacks on two of the kingdom’s international airports, including in the capital Riyadh, after Yemen’s Houthis claimed to have fired on both transport hubs. The Iran-backed fighters earlier took responsibility for a flurry of attacks that included firing a ballistic missile at Riyadh’s King Khalid International Airport as the conflict deepens with Saudi Arabia, which backs Yemen’s government. “On Tuesday and Wednesday … Abha...