Find the murder weapon

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Across
  1. 3. European city known for its elaborate carnaval and special masks
  2. 6. Most people are this during Carnaval.
  3. 9. Prince Carnaval receives this at the beginning of Carnaval.
  4. 10. The ultimate flemish carnaval town
Down
  1. 1. the month in which carnaval takes place in Belgium)
  2. 2. the ultimate wallon carnaval town
  3. 4. The murderer will spend the rest of his life here.
  4. 5. South-American city known for carnaval celebrations.
  5. 7. The last day of the Carnaval festivities
  6. 8. The christian period that starts after Carnaval