Hmm. The headline mentions a left-wing terror group, but nowhere in the entire report is a single point mentioned that has anything to do with left-wing radicalism. Strange kind of reporting and headline choice - shouldn't the headline be related to the content?
With the Bild newspaper I'm used to that sort of thing, it's quite possible that they're just building up a fear scenario again to boost circulation, but I would have expected somewhat more engagement with the article from the Rheinische Post.
I found the RP Online: Politics and the original article there.