CREATE TABLE table_name_67 (casualties VARCHAR2, nature_of_incident VARCHAR2, circumstances VARCHAR2)

Which Casualties have a hostile Nature of incident and Circumstances of mortar attack?
SELECT casualties FROM table_name_67 WHERE nature_of_incident = "hostile" AND circumstances = "mortar attack"
SELECT "casualties" FROM "table_name_67" WHERE "circumstances" = "mortar attack" AND "hostile" = "nature_of_incident"