The norm is that police officers wear guns, the UK is an exception. But even in the UK, police carry guns and rifles during raids – especially if they suspect to be met with armed resistance (as was the case with Kim Schmitz).
If the police plans to raid a building which they suspect hosts armed suspects, like in the case of Kim Schmitz, surely they’ll send in units carrying fire arms.
Countries where Police do not carry guns as part of normal duty:
UK
New Zealand
Japan
Norway
Iceland
Cook Islands
St. Helena
Falkland Islands
Pitcairn Island
sources: http://www.policespecials.com/forum/index.php?/topic/32618-c... http://www.dpreview.com/forums/post/50601024