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Lino Mirgeler / dpa
At least seven people at the Technical University of Darmstadt suffered serious health problems including symptoms of poisoning on Monday.
For one person, the situation was temporarily critical, but is now stable again, said a police spokesman.
Six people reportedly had to be cared for in a hospital.
All of them were in a house of the university and consumed different beverages or foods there.
The investigation at the university continued in the afternoon.
The officials advised everyone who drank or ate something on Monday in building L201 on the Lichtwiese campus and felt uncomfortable or had bluish discoloration of the extremities to seek medical treatment immediately.
In the event of discoloration, one should not move as much as possible and call the emergency doctor immediately.
Hessenschau.de had previously reported on the incidents.
Accordingly, those affected had consumed food in the Institute for Materials Science that was interspersed with an unspecified chemical.
wit / dpa