Far too late.
If they had stopped him sooner, a lot more people would be alive today.
They fact they killed him gives me no joy at all.
It is impossible to stop something like this. I am glad they killed the guy. It tells all the other terrorists what their fate will be.
SOP is to not allow vehicles into an event once it has started, and to have security armed with more than popgun pistols. Not only did the cops take the mussie’s word that he was delivering ice cream but did not search truck before allowing it to pass.