Why did Itachi kill all Uchiha?

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Tags

1. #attribute
2. #however
3. #konoha
4. #sasuke
5. #their
6. #itachi
7. #secret
8. #kishimoto
9. #action
10. #violent
11. #introduced
12. #wanting
13. #killed
14. #agent
15. #orders
16. #under
17. #would