Car with loud bass and then a loud bang - Nanawale

[redefinehappy]

Have any Nanawale residents heard a car with a loud bass speaker driving around in the past few minutes (around 11:45pm)? Just went by my house slowly and then I heard what was either a backfire or a gunshot.

Should I call 911 or is there a non-emergency number? Am I being paranoid?

Grateful for any advice/recs.
Allison