What if in the call they claim the suspect has a nuclear bomb and is threatening to blow up the city? It's kind of a similar scenario, given that I can't remember either of these ever happening. People here don't tend to have guns.
Yeah, this never happens here. Even if it did happen once a decade, it wouldn't be a valid reason to worry about once a week, and it wouldn't be a single anonymous person calling in a tip that someone is threatening to shoot hostages.