Four injured in knife attack at German university
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Police are conducting a "major operation" in the area of the Hamm-Lippstadt University of Applied Sciences where "several people were injured with a knife", they wrote on Twitter, asking people to avoid the area.
A police spokesman told AFP four people had been injured but could not say how badly.
According to the WDR broadcaster, the perpetrator was a young man from Hamm who attacked several students with a knife inside a seminar building.
Three women and one man were injured, WDR said, before other students managed to restrain the attacker.
A bloodstain was visible on the ground outside one campus building, the Westfaelische Anzeiger reported.
Germany was also shocked earlier this year by a rare shooting on a university campus.
An 18-year-old student opened fire in a lecture hall at Heidelberg University in southwestern Germany, killing a young woman and injuring three others before fleeing the scene and turning the weapon on himself.