Witnesses to last year's fiery explosion at a fertilizer plant in West, Texas, have come forward with a new video of the explosion that shows a gas cloud burst into flames.

The video was taken by Jeff Tobola, who was sitting in a car with his son Mason near the plant when it happened.

"I just happened to throw it up at about that time," Jeff Tobola told ABC News affiliate WFAA, saying he shot the video with only a moment to spare.

He shared the video with the Bureau of Alcohol, Tobacco, Firearms and Explosives as part of this investigation into the explosion, which happened one year ago today and claimed 15 lives. More than 160 people were injured.

"When it exploded, you could see the wave of the energy of the explosion actually like in slow motion… like in a movie," Mason Tobola told WFAA.