JUSTIN Trudeau has demanded justice after Iran claimed human error killed 176 plane passengers in an air strike.

The "furious" Canadian Prime Minister said last night: "Canada will not rest until we get the accountability, justice, and closure that the families deserve."

6 Justin Trudeau voiced his anger as he spoke about the plane disaster Credit: AFP or licensors

He added questions remain about Iran's claims over the downing of the Ukrainian plane, which killed 57 Canadians.

The Iranian authority earlier remained adamant the flight was shot down in error.

Mr Trudeau said: "Canada and the world still have many questions, questions that must be answered," Trudeau said in a news conference.

"It is absolutely necessary that Canada participate in this investigation. We expect the full cooperation of Iranian authorities.

He said a "full and complete" investigation is crucial in determining whether the downing of the airliner had been a mistake, and he said compensation by Iran to the families should be "part of the mix".

The Boeing 737 flight came down on Tuesday, hours after Tehran launched a barrage of rockets against US targets in Iraq.

And Iran claimed the deaths were due to the "aggressive" US, which led to the "catastrophic mistake."

After repeated denials, Iran's President Hassan Rouhani admitted his forces gunned down the civilian aircraft because they mistook it for an American fighter plane.

TRUDEAU'S FURY

In a statement, he said: "In an atmosphere of threats and intimidation by the aggressive American regime against the Iranian nation following the martyrdom of general Qasem Soleimani and with the aim of defending against possible US Army attacks, the Islamic Republic of Iran's Armed Forces were on full alert, when unfortunately a human error and miscalculated shooting caused a major catastrophe and dozens of innocent people fell victim to it."

The Iranian leader also offered his "deep condolences" to the families of the victims and said the country's Foreign Ministry would work to identify and bring bodies back to their countries.

Ali Khamenei, the country's supreme leader, has also offered condolences over the plane disaster and called for an investigation.

Iranians tonight clashed with riot police as they stormed the streets of Tehran chanting "death to liars" and demanding Khamenei resigns.

Riot cops flooded in with tear gas as they tried to break up the large groups outside Amirkabir University, who demanded justice.

Around 1,000 protesters chanted "down with the dictator" and "shame on IRGC [Revolutionary Guard], let the country go".

The Iranian military apologised for the disaster, promising to upgrade their systems to prevent such mistakes in the future.

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Iran's acknowledgement of responsibility for the crash is likely to inflame public sentiment against authorities following General Soleimani's killinglast week.

The beloved general died in a drone strike ordered by President Trump was seen as a national icon in Iran.

Soleimani was killed days after Iran-backed militias attacked the US embassy in Iraqi capital Baghdad.

6 He placed flowers on Parliament Hill during vigil for the victims who were killed Credit: Getty Images - Getty

6 Riot police clashed with protesters as they chanted for the leader's resignation Credit: Twitter

6 Protesters gathered in Tehran furious after the Iranian regime admitted shooting down the plane Credit: Getty - Contributor

6 Iran has admitted its forces shot down the plane because they believed the aircraft was a US bomber heading towards a military facility Credit: AFP