Riddle about irritating gas: nine students in Constance injured!

Riddle about irritating gas: nine students in Constance injured!

On Monday at noon there was a moment of shock at the Nell Breuning School when an unknown person exuded irritant gas on the third floor. Nine pupils suffered slight respiratory irritation and had to be supplied by ambulance on site. The police are now investigating and asking the population for clues to the incident under number 0741/4770. Who saw something? The clarification of this frightening incident is still at the beginning.