What is the Fatalities when the tail number was unknown and in Kabul>
CREATE TABLE "accidents_and_incidents" (
  "location" text,
  "aircraft" text,
  "tail_number" text,
  "aircraft_damage" text,
  "fatalities" text
);
SELECT "fatalities" FROM "accidents_and_incidents" WHERE "tail_number"='unknown' AND "location"='kabul';