Volodymyr Zelensky requests an official apology as Tehran says it accidentally shot down Ukrainian passenger jet after repeatedly denying responsibility

After denying responsibility for crash, Tehran says its military shot down the plane, blames 'human error'; crash came hours after Iranian missile attack on US forces in Iraq

Investigators uncertain Iranians will grant necessary access to site, black boxes to determine what caused accident that killed 176 outside Tehran

Tehran continues to claim crash was an accident, Pompeo joins Western officials insisting they have evidence that the Ukrainian airliner was shot down by an Iranian missile

'We can say with certainty that no missile hit the plane,' head of national aviation department says, as world leaders assert intelligence shows otherwise

Sources quoted by major outlets say anti-aircraft system may have accidentally targeted jet; Iran says notion 'makes no sense'; Canada demands role in probe