Once again, health problems at a comprehensive school in Jena have led to a police and fire brigade operation there. On Monday, a student complained of respiratory problems and eye irritation, a police spokesman said on request. A teacher with this problem was also reported. Fire brigade measurements on site initially indicated a substance that did not match the symptoms described. Measurements by the State Criminal Police Office, on the other hand, would not have provided any clues. According to the police, it was the third such incident in the school building, so far no cause has been found. The "Ostthüringer Zeitung" had previously reported.