The Houthis have warned America that if it enters the war in Yemen, it will face a "painful response". According to AFP, Saudi Arabia has asked Washington for help to fight the Houthis. Mohammed al-Bahiti, a member of the Houthis' political bureau, told this news agency: "If the United States intervenes in Yemen's aggression, we will not hesitate to decide on a response." There will be a quick and painful response that will target America and all its interests in the region." He also warned: "All workers and employees of oil facilities and airports in Saudi Arabia should stay away from these places because they have become legitimate targets." On Monday evening, an explosion was reported in Riyadh, but Saudi Arabia said it had intercepted the Houthi missile. After the Houthi attack on Saturday on Riyadh International Airport, in which 13 people were killed, he said Donald Trump that he is considering joining Saudi Arabia in fighting the Houthis, despite reports that he has previously rejected requests for help from Saudi Crown Prince Mohammed bin Salman.AFP via Getty Images