The Tor-M1 missiles were launched at the Kyiv-bound Boeing 737-800 jetliner from the north, according to the report.

The report further said that the plane took off from Tehran at 6:12 a.m. local time and lost all contact with air traffic control at 8,100 feet.

Aircraft disappeared from secondary surveillance radar screens at 6:15 a.m. and from primary surveillance radars at 6:18 a.m, the report added.

French and US accident investigation agencies have refused to send necessary equipment to Iran for decoding the black boxes.

Last week, US President Donald Trump has strongly denied allegations he ordered a campaign pressuring Ukrainian officials to investigate the business dealings of former vice president Biden and his son, part of the impeachment inquiry that will formally read out charges facing the president in the Senate.

The Kiev-bound UIA Boeing 737, crashed shortly after taking off from Tehran on January 8, killing all 176 people on board, mostly Iranian and Canadian citizens. The caskets were to remain for a while at the airport terminal so that relatives and members of the airline could say their last goodbyes.

Tehran admitted it had mistakenly shot down the plane several days later. Ukraine’s leader has demanded that Iran punish those guilty for the downing of the airliner and compensate the victims. Iran’s Prime Minister Hassan Rouhani had tweeted that the country ‘deeply regrets’ the ‘disastrous mistake.’

On January 12, Iranian President Hassan Rouhani promised a further investigation into the circumstances surrounding the plane crash while having a telephonic conversation with Canadian Prime Minister Justin Trudeau.

Then-President Barack Obama lauded the deal – officially known as the Joint Comprehensive Plan of Action (JCPOA) – as a “chapter in this pursuit of a safer and more helpful and more hopeful world,” and later called it “the strongest non-proliferation agreement ever negotiated.”

Iranian President Hassan Rouhani, at the same time, called the landmark agreement a “historic deal and Iranians will be proud of it for generations to come.” People in Tehran danced in the streets to celebrate.

Four-and-a-half years later, this cooperation between the US and Iran has relapsed into enmity, and the optimism has faded into tensions so high they risk all-out war.

President Donald Trump withdrew the US from the deal in May 2018, citing a lack of trust in Iran and calling Obama’s work a bad deal. He then imposed punitive sanctions to cripple Iran’s economy in an unsuccessful effort to force the regime’s leaders to comply with US demands on its behavior.

Trump’s actions have been widely viewed as the catalyst of a series of escalating tensions between the US and Iran, which bubbled to a historic height in recent days.

On January 3, the US killed revered Iranian military leader Qassem Soleimani in a drone strike ordered by Trump.

Two days later, Iran announced it was fully withdrawing from the JCPOA, having since last summer openly taken incremental steps from its commitments that could allow it to develop a potential nuclear weapon.

On Thursday, Rouhani said the country was enriching more uranium than it did before completing the JCPOA in 2015.