President Volodymyr Zelensky attends honor guard for Ukraine International Airlines flight crew and 2 passengers shot down January 8 by Iran's Revolutionary Guard

Official says Iran working to recover data, cabin recordings; Tehran may be hesitant to turn over black boxes that could reveal more details of its downing of Ukrainian airliner

Angry demonstrators at universities in Tehran slam regime for initial denials; security forces separate protesters from pro-government counter-demonstrators

'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