Half a dozen students at a German university had their limbs turn blue and police think someone may have poisoned a campus kitchen

German police are investigating a possible poisoning in a case in which several students fell ill and had their limbs turn blue after using a campus kitchen.

At least seven students and staff at Darmstadt Technical University reported feeling nauseated and having their arms turn blue after using a kitchen in the school's Institute for Material Sciences on Monday, Hesse state police told The Guardian.

Six people were hospitalized in the incident, including one person whose condition was briefly considered life-threatening, according to The Guardian.

Police said on Twitter that investigators found possible poisonous substances in food seized from the Institute for Material Sciences' kitchen.

This is a developing story. Please check back for updates.