It's normal when law enforcement is trying to determine if there are others involved and release of the information may be damaging to the investigation. Also, they may want the information to be correct.
I suspect that, in England and in this instance, that was the case.
But it wasn't in the US when Obama was president.
It was PC all the way. Muslim terrorist only if all other excuses were exhausted and it just couldn't be hidden any more.
"It was the video." Remember?
Or "it was workplace violence".
Both laughable.