With the large loss of Canadian life, Canadian Foreign Affairs Minister François-Philippe Champagne and Transport Minister Marc Garneau both expressed sympathy for the victims. Champagne announced that he was in touch with the Ukrainian government, and Garneau announced that Canada was offering assistance in the investigation. Prime Minister Justin Trudeau insisted on transparency and justice for the families and loved ones of the victims. On 14 January, Trudeau said tensions and escalation between Iran and the United States were responsible for the shootdown.
The head of the commission for accidents in the CAOI said they received no emergency message from the aircraft before the crash. It was reported that the aircraft's black boxes (the cockpit voice recorder (CVR) and flight data recorder (FDR)) had been recovered, but the CAOI said it was not clear to which country the recorders would be sent so the data could be analyzed. The association said it would not hand over the black boxes to Boeing or to U.S. authorities. On 9 January, the black boxes were reported, by Iranian investigators, to have been damaged and that some parts of their memory may have been lost. Mary Schiavo, a former U.S. Department of Transportation inspector general, said no automated distress messages had been sent from the aircraft or by its crew.
More InfoIranian Supreme Leader Ali Khamenei vowed to take "harsh revenge" against the U.S., and declared three days of mourning. President Hassan Rouhani also said Iran "will take revenge". Foreign Minister Mohammad Javad Zarif called the attack "an extremely dangerous and foolish escalation". Iran sent a letter to the United Nations, calling it "[s]tate terrorism" and said it violated principles of international law. On 7 January, Iran's parliament approved a €200 million increase in the Quds Force's budget, to be used in two months. Reuters reported that some Iranians including Soleimani supporters fear that a war could break out at a time of economic hardship and widespread corruption. Some older Iranians recalled memories of the Iran–Iraq War.
More InfoOn 11 June, Iran announced that the flight recorders would be sent directly to the Bureau d'Enquêtes et d'Analyses pour la Sécurité de l'Aviation Civile (BEA) in France. Canadian officials urged Iran to complete this action "as soon as possible", citing the previous delays in handing over the recorders. This statement was further reinforced 11 days later, when Iranian foreign minister Mohammad Javad Zarif commented on this intention during a phone call with Canadian foreign minister François-Philippe Champagne.
More InfoOn 2 February, Ukrainian TV channel aired a leaked recording of the information exchange between the Iranian pilot of an Aseman Airlines flight and an Iranian air-traffic controller. The pilot allegedly stated in Persian that he saw a flash similar to missile fire in the sky, and then an explosion. Following the leak, the Ukrainian President Volodymyr Zelensky said the new evidence proved Iran was well-aware from the very first moments that the Ukraine passenger airplane was brought down by a missile. The following day Iran ceased co-operation with Ukraine in its investigation into the disaster due to this leaked recording. Iran resumed co-operation on 15 February.
More InfoOn 9 January, the Instagram account Rich Kids of Tehran published a video captioned: "The actual footage from the moment the #Ukrainian flight was shot down by a Russian-made Tor-M1 missile just moments after takeoff from #Tehran's Airport ". The video was published at the same time the Iranian authorities were claiming technical problems for the crash. Qassem Biniaz, a spokesman for Iran's Road and Transportation Ministry, said the pilot "lost control of the plane" after a fire broke out in one of its engines, denying the Ukrainian plane was hit by a missile.
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