Freiburg (dpa / lsw) – After hundreds of bats died in the ventilation system of a Freiburg university building, the police have completed their investigations. A police spokeswoman said on Monday that the files were sent to the Freiburg public prosecutor’s office last week. The “Badische Zeitung” had also reported. A suspect could not be found. Because of a hole in a protective grille, about 2,400 bats got into the ventilation system and 700 died. Employees discovered the animals on several floors of the chemistry building at the end of July.