The first part of this section of the list of rampage killers contains those mass murders where the perpetrators predominantly targeted their (former) co-workers, while the second part focuses on cases where soldiers willfully killed their own comrades. A rampage killer has been defined as follows: A rampage involves the (attempted) killing of multiple persons least partly in public space by a single physically present perpetrator using (potentially) deadly weapons in a single event without any cooling-off period. This list should contain every case with at least one of the following features: