"Police treated people who had gathered with patience and tolerance", Tehran Police Chief Hossein Rahimi said in a statement on state media.
"There's no blame here for America", McCarthy said.
By Ottawa's count, 57 of the passengers were Canadian citizens, many of them dual Iranian nationals. "There's no doubt where the blame lies", Mr. McCarthy told reporters.
Iran's air defences had been on the highest state of alert before the shooting because the country had just fired more than a dozen ballistic missiles at U.S. bases in Iraq in retaliation for the killing of Iranian general Qasem Soleimani in a USA drone strike in Baghdad.
"Demonstrations that had been attacking the USA for killing Iran's top general quickly turned into calls of 'death to the dictator, ' a reference to Supreme Leader Ayatollah Ali Khamenei", as NPR's Peter Kenyon reported in the wake of the government's shifting narrative about the crash.
All 176 people on board were killed when Iranian defense units fired at the plane, bringing it down shortly after take-off from Tehran.
Tasnim also said that out of 15 missiles fired at USA bases in Iraq on January 8, two fell on Iranian territory, apparently due to technical malfunction. All 176 people on the plane, the majority of whom were heading to Canada, were killed.
In a Global News interview Monday, Trudeau said had it not been for the recently elevated tensions in the Middle East, "those Canadians would be right now home with their families". "Innocents bear the brunt of it".
When Simpson asked Republicans in Congress about Trudeau's comments, House Minority Leader Kevin McCarthy put the blame for Flight 752 being shot down exclusively and firmly at the feet of Iran.
"I was in Oman just at the weekend, talking to people in the region and they don't want a military conflict between the West and Iran".
"The blame for this awful atrocity lies with the Iranian Regime alone", Scheer tweeted Tuesday.
Asked whether Iran should face consequences, Johnson told the BBC, "They're clearly guilty of an appalling error, I don't think we are now envisaging any further escalation of the tensions".
Working to re-establish relations with Iran was one of Trudeau's 2015 election campaign promises, but the prime minister suspended those efforts in June 2018 over several points of contention.
Mr. McCarthy's direct references to the shooting down of the plane are unusual among Mr. Trump's allies.
Transportation Safety Board chair Kathy Fox also has said Iran has indicated Canadian investigators will have access to the black box flight data recorders from the plane, but cautioned Canada's role in the investigation beyond that remains unclear. No American forces died in the attack, as the Iranian government had notified Iraq before launching the strike.
The shootdown came just hours after Iran launched ballistic missiles at two bases housing United States troops in response to Trump's order to kill the revered Iranian general, who commanded the elite Quds Force and led Iran's campaign to expand influence across the Middle East.