Re: Bloody hell! They came back!

If it were cats, I'd know a way:  there's a system here you can buy to 
protect your fish (if you have a pond). It is a simple water-canon, with 
a motion detector. If something moves while the system is switched on, 
it receives a big splash.
Cat's don't like water, so it works on them. But 'm not sure if the 
piggies would not also be detected and get soaked...
On top of that, I'm not sure if a dog would be impressed by water.

I would first get my piggers to safety, then try to find out who the 
owners are. If they won't cooperate, I would call the police again.