Generally yes. It may depend on your jurisdiction, however we respond to every single call for service no matter how selective we would want to be. This goes back to the neutrality and the government service. We can't pick and choose. A citizen called in a suspicious person we will have to respond.
Imagine if it sounded like nothing and we didn't go and this guy shoots up a building full of people...we would be held accountable that we didn't respond and investigate