Attempted murder probe after seven poisoned at university

German police have opened an attempted murder investigation after seven people who had consumed food and drink at a university kitchen showed symptoms of poisoning on Monday.

Blue discolorations appeared on their limbs following the incident at Darmstadt Technical University, German police and the public prosecutor in the federal state of Hessen said in a press release Tuesday. A police spokesman told CNN on Wednesday that six people were hospitalized, one of whom was a 30-year-old student who was initially in a life-threatening condition.