Iran has acknowledged on that its armed forces fired two Russian anti-aircraft missiles at a Ukrainian jetliner that crashed after taking off from Tehran's main airport earlier this month, killing all 176 people on board.

The new preliminary report by Iran's Civil Aviation Organization, however, stopped short of blaming the TOR-M1 for the crash of the Boeing 737-800, flown by Ukraine International Airways.

For days after the January 8th shootdown, Iran denied that it fired missiles at the plane, initially blaming a technical malfunction and engine fire for the crash.

However, after the US and Canada blamed missile fire for the crash, Iran's armed forces said anti-aircraft fire from the country's paramilitary Revolutionary Guard had downed the flight.

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The new report identified the missiles fired at the aircraft as coming from the TOR-M1. In 2017, Iran received the delivery of 29 TOR-M1 units from Russia under a contract worth an estimated $700 million.

Ahmad Ahmadi, from left, his wife Forough Hamidi and Banafsheh Razzaghi mourn the loss of their relatives who died in a Ukraine airplane crash in Iran. Photo / AP
Ahmad Ahmadi, from left, his wife Forough Hamidi and Banafsheh Razzaghi mourn the loss of their relatives who died in a Ukraine airplane crash in Iran. Photo / AP

However, the report said, "the impact of these missiles on the accident and the analysis of this action under is under investigation."

Surveillance footage earlier obtained by The Associated Press showed two missiles were fired at the plane. The two minutes of black-and-white footage purportedly shows one missile streaking across the sky and exploding near the plane. Ten seconds later, another missile is fired. Some 20 seconds after the first explosion, another strikes near the plane. A ball of flames then falls from the sky out of frame.

The footage corresponded with AP reporting, appeared genuine and matched geographic features of the area. It also explained how so many people filmed the shootdown: the first explosion drew their attention so they turned their mobile phone cameras to the predawn sky.

The Tor short-range air defence system, code-named the SA-15 by NATO, was designed during Soviet times to shoot down aircraft and precision-guided weapons.

It is mounted on a tracked vehicle and carries a radar and a pack of eight missiles. Each vehicle can operate independently. Tor has a range of up to 12 kilometres and can hit aerial targets at altitudes of up to 6 kilometres (about 19,700 feet).

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Tor missiles explode near their target, taking it down with shrapnel that devastates engines, fuel tanks and other vital components.

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In other developments on Tuesday, South Korea's Defence Ministry announced its anti-piracy unit operating in the Gulf of Aden was temporarily expanding its mission to the Strait of Hormuz. A ministry statement said the decision was meant to help ensure the safe passage of South Korean vessels and nationals through the waterway. It said the unit's expanded operation will include the Gulf of Oman and the Persian Gulf.

The ministry said the unit will conduct an independent operation but will cooperate with a US-led coalition if necessary. Already, a US-led operation is surveilling the strait, the narrow mouth of the Persian Gulf through which 20per cent of all the world's oil passes. A French-led naval coalition is also being created.

The missions began after mysterious explosions last summer targeted oil tankers near the strait, attacks the US blamed on Iran. Tehran denied being involved, though it did seize tankers amid wider tensions with the West over its unraveling nuclear deal with world powers.

- AP