Mystery in London

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Across
  1. 2. hit a door to tell people that you are outside
  2. 6. you send this to someone by post
  3. 7. move through water using arms and legs
  4. 9. move quickly into or onto something
  5. 10. a person who tries to find criminals
  6. 12. a metal circle people wear in their ears
  7. 14. something you use to travel across the sea
  8. 15. a person who kills other people
  9. 16. red liquid inside the body
Down
  1. 1. something you use to cut things
  2. 3. something or someone a lot of people know
  3. 4. try to hurt someone
  4. 5. a person who breaks the law
  5. 7. not in danger
  6. 8. very bad
  7. 11. not in prison
  8. 13. information, for example on the radio or TV
  9. 14. a person who works on a ship