Iran agency says chain of errors caused Ukrainian plane crash

Iran's Civil Aviation Organisation blamed a misalignment of a radar system and lack of communication between the air defence operator and his commanders for the accidental downing of a Ukrainian passenger plane in January that killed 176 people aboard.Iran's Revolutionary Guards shot down the Ukraine International Airlines flight with a ground-to-air missile on Jan. 8 shortly after the plane took off from Tehran,in what Tehran later acknowledged as a “disastrous mistake” by forces wh