TS Kelso at AGI put out an interesting white paper with more details: https://www.agi.com/resources/white-papers/analysis-of-the-i...

Kelso is also the brains behind CelesTrak for debris tracking: https://www.celestrak.com

There are also a number of videos on YouTube of the collision profile, made using AGI's Systems Toolkit: https://www.youtube.com/watch?v=7oRC9dHKI9Y

I'm unclear what "at a speed of" means. Is this relative velocity or just how fast they were both orbiting? Why phrase it this way, I wonder.