On 9 June 2020, U.N. Secretary-General António Guterres stated in his biennial report to the UNSC on the Iran arms embargo that cruise missiles used in multiple 2019 attacks on Saudi Arabia had Iranian origin. Cruise missiles or drones used in the 2019 Afif attack, the 2019 Abqaiq–Khurais attack and the 2019 Abha International Airport attacks had Iranian origin, as were several items of materiel interdicted by the US in November 2019 and February 2020. Some items were allegedly transferred[clarification needed] between February 2016 and April 2018 in a matter possibly "inconsistent" with Resolution 2231:[5]