This section of the list of rampage killers contains notable mass murders, committed by lone wolf perpetrators, that have a foremost religious, political or racial background. 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: All abbreviations used in the table are explained .