Same thing happened to my neighbor a few months ago! Same tactic,except she finally went to door to confront them after they started banging on front and back door. They came running around from back of house and jumped in car....firing off a shot at her!! Very unnerving. Police did not even include the gun incident in police report. I actually called them asking why not and what happened and they said gun fire was not reported because they never found the bullet...only the shell casings!! I was stunned.
Their advice was to always answer door...lol. Glad you are ok!!
Criminals have cars. Suburban homes in previously-low-crime areas are both softer targets and have better stuff to steal (laptops, ipads, jewelry, etc).
Expect this trend to increase. Stay armed.