sentences:  At the time, the shootdown was Ukraine's deadliest aviation disaster and the deadliest aviation disaster involving the Boeing 777.On 8 January 2020, Ukraine International Airlines Flight 752 was shot down by the Iranian Armed Forces shortly after take off from Tehran Imam Khomeini International Airport, killing all 176 people on board.After initially denying responsibility, Iran admitted on 11 January 2020 that the plane was unintentionally shot down when it was mistaken for a hostile target as it turned towards a "sensitive site" of the Islamic Revolutionary Guard Corps.