I can guess why you started this thread, but maybe this is not the story you expected?
The death and injury toll are terrible and rising, but this does not appear to be a re-run of the 2016 Islamist attack on a German Christmas market:
https://www.theguardian.com/world/li...087cf068f2e1d0
The man arrested has been identified as Taleb A., a 50-year-old medical doctor from Saudi Arabia.
Saxony-Anhalt’s leader Reiner Haseloff said the man had been living in Germany since 2006. The suspect, a consultant for psychiatry and psychotherapy, was recognised as a refugee in 2016.
Some German media pointed to the suspect’s past social media posts in which he reportedly expressed views critical of Islam and had even warned of the “dangers” of an Islamisation of Germany.
“As things stand, he is a lone perpetrator, so that as far as we know there is no further danger to the city,” Haseloff said.
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Der Spiegel reported that the suspect had sympathised with the AfD. The magazine did not say where it got the information.