
Why wa he arrested?
He was quite clearly arrested as it could have been very easy for him to dispose of the weapon ( if he had one by throwing it in a bin bush, garden river etc....
So until a proper search could be conducted and appropriate evidence gathered from CCTV, he would need to have been detained, what if the police let him go, he picked up the weapon and went on to a school and killed innocent children.
If that happened then the police would be held accountable, so lets not give them a hard time for doing their job on the inteligence that they have been given.