I get a lot of phone solicitations on my land line. Fairly recently, many of them appear to have local numbers. Area code and prefix. Like they are coming from a neighbor, or nearby business.
It turns out there is software which allows the caller to utilize a fake local number.
Perhaps the police in this case recognized a local number, and didn't even think to question the veracity of the call.
Just dash over to the address given, and start shooting.