Iran claims "human error" was responsible for the downing of a Ukrainian passenger plane earlier this year that killed all 176 people on board.
The Iranian Civil Aviation authority said late Saturday, "A failure occurred due to a human error in following the procedure" for aligning the radar.
The misalignment caused a "107-degree error" in the system, Iran said.
The downing of the aircraft happened while Iran's defense system was on high alert after one of the country's top generals was killed in a U.S. missile attack in Iraq.
Scenes of Mourning, Anger in Wake of Ukraine Plane Crash Iranian officials, after days of denials, admitted Jan. 11, 2020, that Tehran was responsible for mistakenly downing a Ukrainian airliner early on Jan. 8. Iran's admission sparked anti-government protests in Tehran. Demonstrators gathered at two universities, where some called for the resignation of their country's leaders.