Hagen (dpa / lnw) - A 46-year-old was seriously injured in an accident at work in a surface technology company in Hagen. A metal lid fell on his head, the police said on Saturday. After the accident on Friday, the man was flown to a hospital. The cause is still unknown, the criminal police and the Office for Occupational Safety are investigating. There was also no information about the size and weight of the metal lid.