Because they need to take care of the dead and wounded. They needed to secure the site. They needed to get search warrants. They needed to make sure he was acting alone.
All in the middle of the night.
Communicating with us was pretty far down on the list. And rightly so.
See post 22 for the REAL reason for the delay...
A converted muzzoid jihadist!
As long as it stays on the list.