Check this out. Someone left the siren on in a police car. A large number of zombies have surrounded it, effectively making it impossible to turn it off.
Not sure if this is a bug, but it's problematic because the sound of the siren gets annoying.
Also, if you die while hearing the police siren, you will continue to hear it constantly at the same volume, wherever you go. A workaround for now is to restart the game.
Pictured are me and arkahys' futile attempts to reduce the number of zeds. Guess the MPD base is no more...
On a side note, what did the blog post mean by "As ever free PZ codes will be available to those who join in"? Will I receive a code that I can give to a friend, who I can recruit to bug test with me? And how do you suggest a picture for the devs to feature on the blog?