Britain said on Friday Irans launch of a military satellite this week was "of significant concern" and inconsistent with a United Nations resolution. "Reports that Iran has carried out a satellite launch – using ballistic missile technology – are of significant concern and inconsistent with UN Security Council Resolution 2231," a British Foreign Office spokesman said. "The UN has called upon Iran not to undertake any activity related to ballistic missiles designed to be capable of delivering nuclear weapons. Iran must abide by this." US Secretary of State Mike Pompeo called on Wednesday for Iran to be held accountable for the launch, and said he believed it defied the Security Council resolution. The 2015 resolution "called upon" Iran to refrain for up to eight years from work on ballistic missiles designed to deliver nuclear weapons following an agreement with six world powers to limit its nuclear program. A senior US administration official said on Thursday that a declassified assessment of this weeks launch determined that it was overseen by Amirali Hajizadeh, the head of the aerospace division of the Revolutionary Guards, at a site in eastern Iran. The official said Hajizadeh has also been behind other missile launches.