For what it's worth these days, the press is reporting that one officer was killed and another wounded, and that seven US Marshals engaged the scumbag before killing him.
The weapon used is mercifully unknown at this time.*
This seems to be the 'Duh' statement in all of this:
The shootings have immediately raised questions about security at public buildings in Las Vegas.And elsewhere, as time and time again it has been proven that security ain't so secure.
*I see now that CNN is saying that the scumbag used a shotgun.