New video footage has emerged showing two Iranian missiles tearing through the night sky and hitting a Ukrainian passenger plane, sending the aircraft down in flames and killing all 176 passengers and crew on board.
The projectiles were fired 30 seconds apart and explain why the plane's transponder was not working as it hurtled to the ground
The New York Times reported that it was disabled by the first strike, before being hit by a second. The newspaper published the verified security camera footage.
The blurry film, shot from a rooftop in a village 6km from an Iranian military site, shows the Kiev-bound plane on fire and circling back to Tehran's airport, the Times said.
Minutes later, the aircraft exploded and crashed.
Iran had for days denied Western claims that the Boeing 737 had been downed by its missiles.
Iran came clean on Saturday when Revolutionary Guards aerospace commander Brigadier General Amirali Hajizadeh acknowledged a missile operator had mistaken the Ukraine International Airlines plane for a cruise missile and opened fire.
The incident happened when Iran's armed forces were on heightened alert after launching a volley of missiles at Iraqi bases hosting US troops in retaliation for the killing of top general Qasem Soleimani on 3 January.
Iran has struggled to contain the fallout over its handling of the air disaster and the tragedy has seen hundreds of angry protesters, most of them students, take to the streets.
New videos circulating on social media purported to show fresh protests yesterday evening at universities in Iran, along with clashes between students and Basij militia loyal to the establishment.
It was not possible to immediately verify the videos.
Earlier, AFP correspondents said around 200 mainly masked students gathered at Tehran University and were locked in a tense standoff with youths from the Basij.
Kept apart by security forces, the groups eventually parted ways.
Around 30 people have been arrested in the protests over the air disaster, according to judiciary spokesman Gholamhossein Esmaili.
Yesterday, Iran said it had made its first arrests over the shooting down of the plane, though it gave no details.
Recent protests have been much smaller than nationwide demonstrations against fuel price hikes that turned deadly in November.
Iran's President Hassan Rouhani called for "national unity" after the incident.
"The people want to make sure that the authorities treat them with sincerity, integrity and trust," said Mr Rouhani, also calling on the armed forces to "apologise" and explain what happened in the air disaster.