As HAL said, it’s always attributable to human error.
It is part of an automated assembly line that is capable of functioning without a human operator, but it is believed it may have been under human control at the time of the accident.
Mr Hillwig said he could not provide any further details as the case is now under police investigation.
Initial reports suggested human error may have been to blame, rather than a problem with the machine.
But the state prosecutor’s office in Kassel said that had not yet been confirmed.