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Is there a rule between mods that a topic should have an explanation posted with it when it's locked?
Yes there is, else we get threads like this one; however sometimes it can be easily neglected when several things need to be dealt with at the same time.
If you aren't sure why a thread has been closed and no explanation has been given, please send a message to either myself or to one of the moderators.
In this case, I don't think news stories about necrophilia are very suitable for the forum, which will have been the reason it was closed.
Since this has now been solved, i'll go ahead and close this topic also.