I'm not sure how, but it is possible contact actual authorities about this. I'm not sure if they would be of any help, but it's worth a shot.
It might seem kind of strange, but I really do not want to be the one to do it. I do not want to be personally involved with police in any way. Like, I'm actually scared of it. I have seriously thought about contacting them, but I really don't want to be involved in any kind of legal situations.
