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Related Clues:
- Falter - stop
- Alert for the squad, for short
- Message from police HQ
- Sometimes things grind to this
- Stop moving
- Sentry's imperative
- The 9-Down might put one out, briefly
- 911 call follow-up, perhaps
- 'Dragnet' message, for short
- Police alert: Abbr
- Stop marching
- 'Stop!,' at a checkpoint
- Checkpoint demand
- "Red light!"
- "Calling all cars" letters