Canadian Prime Minister Justin Trudeau has accused Iran of shooting down a commercial plane that killed 176 passengers and crew.
The Ukraine Airlines plane crashed shortly after taking off from the capital Tehran en route to Kiev.
The accident came just hours after Iran launched a series of missile strikes targeting US forces in Iraq following the assassination of an Iranian military leader.
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Officials in Iran quickly blamed a technical fault for the crash.
But Mr Trudeau says evidence is growing of something more sinister.
“What happened yesterday was a tragedy. A tragedy that shocked not only Canada but the entire world,” Mr Trudeau said.
“We have intelligence from multiple sources, including our allies and our own intelligence that the plane was shot down by an Iranian surface-to air missile.
“This may well have been unintentional.”
Of the 176 victims. 63 were Canadian with many of those part of a wedding party.
“The families of the victims and all Canadians want answers. I want answers,” Mr Trudeau said.
“That means closure, transparency, accountability and justice.”
US officials have backed Mr Trudeau’s assessment, saying it was ‘highly likely’ an anti-aircraft missile brought down the plane.
US President Donald Trump says he doesn’t believe mechanical failure is to blame.
“I personally don’t even think that’s even a question,” President Trump said.
“It was flying in a pretty rough neighborhood. Somebody could have made a mistake.”