Evidence suggests an Iranian missile brought down a Ukrainian passenger plane that crashed near Tehran, possibly in error, Western leaders say.

Canada and the UK called for a full and thorough investigation into the crash, which killed all 176 people on board.

Iran’s civil aviation chief, however, said he was “certain” that the plane was not hit by a missile.

The crash came just hours after Iran carried out missile strikes on two airbases housing US forces in Iraq.

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