Why did I receive a Reddit warning for "Upvoting content encouraging violence"?

Here's the message from Reddit. There's no link to any of the supposedly "violent" content so how am I supposed to ensure I don't do it again in the future? Also, that there is no option to ask for further information.

If we can now be punished for the things we upvote then we should at least be told exactly what that content is.

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