What are these flashes of light taking place on WTC 7 as it fell?

By slowing the footage down a series of quick light flashes can be seen happening on WTC 7 as it fell on 9/11. This video points them out, focusing on two different clips of the building’s unlikely collapse and highlighting the flashes as they happen.

I apologize for the repetitive nature of the video, however for the purpose of truly catching the strange flashes the clips need to played a few times at different speeds.

The first clip shows one flash of light taking place from a far away distance . The second clip shows two flashes of light…one happening right after the other. That clip was taken from the street.