SELECT "Casualties" FROM table_15451 WHERE "Nature of incident" = 'hostile' AND "Date" = '2006-06-26'
Name the casualities for nation of incident of hostile on 2006-06-26
CREATE TABLE table_15451 (
    "Date" text,
    "Location" text,
    "Nature of incident" text,
    "Circumstances" text,
    "Casualties" text
)