Iran's civil aviation body blamed a misaligned radar and an error by an air defence operator in a final report into the shooting-down of a Ukrainian passenger plane in January 2020 that killed all 176 people aboard.
The report on Wednesday into the downing of Ukraine International Airlines Flight PS752 "makes no attempt to answer critical questions about what truly happened and appears incomplete," Canada said in a statement.
Many of the victims killed in the crash were Canadian citizens or permanent residents.