Iran said that the misalignment of an air defence unit's radar system was the key "human error" that led to the accidental downing of a Ukrainian passenger plane in January, according to Reuters.

Iran says 'human error' to blame for downing of Ukrainian jet

Several people have been arrested in Iran over the downing of a Ukrainian passenger plane as Iranian President Hassan Rouhani warned that those responsible would be punished.

West Asia crisis intensifies; Countries mull legal action against Iran

Amid row over the crash of Ukrainian plane in Tehran, Iran's civil aviation chief Ali Abedzadeh said on Friday he was "certain" that the aircraft was not hit by a missile.

Ukrainian aircraft was not hit by a missile: Iran's civil aviation chief