Britain, France and Germany on Thursday condemned a spate of attacks on Saudi Arabia claimed by Iran-aligned Houthis in Yemen, saying the proliferation of drones posed a serious threat to regional stability. Saudi Arabia told the United Nations Security Council on Thursday that an attack on Wednesday on Abha International Airport caused a fire on a civilian plane, describing it as a “heinous war crime.” “Such acts of terrorism by the Houthis continue to jeopardize the efforts of United Nations to reach a comprehensive political solution in Yemen,” Saudi U.N. Ambassador Abdallah Al-Mouallimi wrote in a letter, calling on the 15-member body to condemn the attack. Yemen’s Houthi group said it had carried out a drone attack on the airport. A Saudi-led military coalition intervened in Yemen in 2015, backing government forces fighting the Iran-aligned Houthis. The more than six-year long conflict is widely seen as a proxy conflict between Saudi Arabia and Iran.