President Trump said: "Somebody could have made a mistake".
"When families lose loved ones, they deserve to know what happened".
Ukrainian President Volodymyr Zelensky has issued a direct plea to his Iranian counterpart to ensure that Canadian aviation safety officials are included in the investigation into the downing of Flight PS752.
The official said the data showed the plane airborne for two minutes after departing Tehran when heat signatures of two surface-to-air missiles were detected. The Canadian PM also added that the act might've been unintentional but the new information calls for a thorough investigation.
Earlier on Thursday a United States official, citing an extensive review of satellite data, said Washington had concluded with a high degree of certainty that anti-aircraft missiles brought the plane down. "If there was an explosion in the wings it should have been much more scattered", Abedzadeh added, noting that analysing the black box data "will take time".
Iran retaliated for the January 3 U.S. drone strike in Baghdad that killed a top Iranian general.
An unverified video has also emerged which purports to show a missile hitting the plane.
Mourners in Toronto console each other during a vigil for the victims of Ukrainian Airlines flight 752 which went down in Iran on Jan 8, killing everybody aboard.
Ukraine said it was looking into a number of possible scenarios to explain the crash, including a missile strike, an in-flight collision and terrorism.
Iran's civil aviation chief said Tehran had invited "Americans, Canadians, the French, Ukrainians and the Swedish" to be present during the investigations, showing that "we are honest in our procedure".
"The circumstances of this catastrophe are still unclear", Sergiy Kyslytsya, Ukraine's deputy foreign minister said at a United Nations meeting in NY.
"It's now up to experts to investigate and to find answers to the question of what caused the crash".