[relee]

... Ever heard of anybody bursting in and shooting up a police station. ...

Sadly, yes.

http://www.outsidethebeltway.com/fairfax_virginia_police_station_shooting_/

[ROCKLOBSTER]

>>...Ever heard of anybody bursting in and shooting up a police station... Sadly, yes.<<

I don't think it's all that common, he must have committed suicide by policeman as:

The gunman was killed in the shootout with police