What we are finding out:
Twenty-nine year-old resident Maurice P was arrested on suspicion of attempted homicide in the town of Volkmarsen.
The motive of the attack was still unclear on Tuesday but police denied a report that the man was drunk.
What do we know about the suspect?
Maurice P was himself injured and police said they had yet to question him. They raided his home late on Monday and his landlord told local broadcaster Hessenchau that he was a "very calm, totally inconspicuous and always polite person".
More: https://www.bbc.com/news/world-europe-51626844?intlink_from_url=https://www.bbc.com/news/world&link_location=live-reporting-story
The article also states, there was an erroneous picture on the internet floating around of a man said to be arrested but it was not the culprit. So, they aren't really telling us a lot.