> It kept ringing even as we telephoned and despite the fact no one could be seen at the door.

> Together residents and police discovered the slug

they did?

If they could tell no one is there why didn't they ring the electrician rather than the cops? Doorbell going off? No one there? Must be crazy invisible teens next door, not a short in the doorbell.

It sounds like they called the police first before going down to check.