- Ukraine International Airlines Flight 752 crashed in Iran on Wednesday morning, killing all 176 people on board.
- Iran has sought to blame technical issues with the plane, but it is now being accused of shooting down the plane itself with an anti-aircraft missile.
- Rising political tensions in the region have led to conflicts over what countries and companies are involved in the investigation into the crash, and Iran has accused those blaming it of shooting the plane of "big lies."
- Here's everything that has happened so far.
- Visit Business Insider's homepage for more stories .
Ukraine International Airlines Flight 752 crashed just minutes after taking off from Tehran, Iran on Wednesday morning, killing all 176 people on board.
What started as Iran claiming that a technical issue was to blame has led to the country being accused of accidentally shooting down the plane itself as it was on heightened military alert due to US missile strikes.
Iran is denying involvement as the US and Canada point to intelligence that they say suggest a missile is to blame.
The fallout has been marked by changing explanations and political roadblocks over who is involved in investigating the cause of the crash and who is to blame.
Here is a chronological timeline of how the crash and its aftermath has unfolded so far:
- Iran is doubling down in calling allegations that it shot down Flight 752 a 'big lie,' accusing the US of carrying out a 'psychological operation' to discredit its story
- Ukraine is investigating if the plane that crashed in Iran killing 176 people was brought down by a missile or terrorist attack
- Ukrainian Flight 752 was on fire and seemed to be turning back before it crashed in Iran and killed 176 people, the first report into the disaster said