A 76-year-old lone gunman went on a shooting rampage in the offices of the shipping company that used to employ him in Athens, killing three people, including a female member of the company’s owning family, and then took his own life, Greek police said on Monday.

Security forces cordoned off an area around European Navigation, a Karnessis family-controlled owner of product carriers, in the seaside suburb of Glyfada, suggesting this was the scene of the crime.