CREATE TABLE table_68828 ("Date" TEXT, "Location" TEXT, "Nature of incident" TEXT, "Circumstances" TEXT, "Casualties" TEXT)

What is the nature of the incident with Casualties of 3 wia, and Circumstances of ied?
SELECT "Nature of incident" FROM table_68828 WHERE "Casualties" = '3 wia' AND "Circumstances" = 'ied'
SELECT "Nature of incident" FROM "table_68828" WHERE "Casualties" = '3 wia' AND "Circumstances" = 'ied'