Following a deadly attack near a Christmas market in Strasbourg on Tuesday evening, the German federal police put up controls at several border crossings from Germany to France.
Berlin police on Tuesday night shot and killed the father of a young girl at a refugee home as he tried to attack a man who allegedly sexually abused his daughter.
Police have said that a 41-year-old man was behind three deaths in Bayreuth, northern Bavaria late on Sunday evening, shooting his ex-girlfriend, her father, and himself.
A 15-year-old German boy who became embroiled in a tense armed stand-off with police after taking guns into his school has been sentenced to four and a half years in youth custody.
Four children were injured in the eastern German state of Thuringia on Tuesday when air pistol shots were fired into their classrooms from a building opposite. Three suspects have been arrested.
Police in California have arrested a German university professor after he wrote about gunning down students at his late son's high school and then killing himself, it was reported on Thursday.
Each year at least 400 German schoolchildren threaten to attack their school or college, a new study based on previously unpublished data shows. Poor record keeping is probably keeping the figure artificially low, its author warned.
A high school in southern Germany has been evacuated after pupils and teachers heard a gun shot on Tuesday. The pupil, who is thought to have two guns, is missing. No-one has been injured.