My brother in laws wife is a tower controller at KFDK, she was in the CAB taking a break and witnessed the accident as it happened. Most horrific thing she ever witnessed she said. I was listening to the live feed from work when it happened, did catch the actual accident; just the controller advising Class D airspace was closed due to the accident.
Listened to the recording later. I'm still nauseous this morning. Blessings, thoughts and prayers with the victims, survivors and families.