New York Times claimed that it has verified the footage, which shows a rapidly-moving object rising to an angle into the sky before a flash is noticed, which dims and continues moving forward. After several seconds, an explosion is heard.
"We have seen some videos. We confirm that the airplane was on fire for 60 to 70 seconds," Abedzadeh said.
But to say "that it was hit by something cannot be scientifically correct," the aviation chief added.
On Thursday, Canadian Prime Minister Justin Trudeau claimed that probe from multiple agencies showed that the plane was crashed after it was shot down by an Iranian missile.
63 Canadians were amongst the 176 people that were killed in the crash.
UK Prime Minister Boris Johnson also backed Trudeau's claims and said that the missile targetting the aircraft "may well have been unintentional."
The Ukranian airlines' Boeing 737 crashed after taking off from Tehran on Wednesday, nearly at the same time when Iran claimed it fired two missiles on US airbases in Iraq.