After the symptoms of poisoning in at least seven people at the Technical University of Darmstadt, the university speaks of a suspected poison attack.
"We are shocked by the obvious crime that has occurred at our university," said the president of the university, Tanja Brühl, on Tuesday.
After initial investigations by the police, those affected are believed to have been victims of a poison attack.
"I will contact you personally as soon as possible, provided your condition allows it."
According to the police, several people with symptoms of intoxication such as malaise and discoloration were brought to clinics on Monday.
A laboratory analysis should show which substance is involved.
Other foods and drinks that were on the Lichtwiese campus are also examined.
The police assume that several milk cartons and water containers in building L201 on campus were mixed with the substance between Friday and Monday.