Informatiebrief poging tot moord (13 letters)
This is a more formal and informative title that clearly conveys the purpose of the letter: to inform the citizen about an attempted murder.
Alternative:
- Waarschuwingsbrief: Poging tot moord (12 letters)
This title is more attention-grabbing and emphasizes the seriousness of the situation. It could be used if the goal is to alert the citizen to potential danger.