A never-before-seen-footage of the collapse of Twin Towers was shared by a witness 23 years after the horrific event.

The video, posted on YouTube by Kei Sugimoto, was taken from a previously “unseen angle.”

According to Kei, it was taken “from the roof of 64 St Marks Place in NYC on a Sony VX2000 with teleconverter” on September 11, 2001, with a Sony VX2000 camera.

He recalled the tragic day saying he first believed that a fire broke in the building. However, it wasn’t until the second attack took place that he realized what had really happened. Read more below