Need help remembering if this was a tv show or movie

[Thumber]

Hi All,

This is my first post so hi to everyone :)

I hope that someone can help me out on this one.

I watched this back in the early 80's but cannot remember the title or if it was a tv show (twilight zone, cliffhangers etc..) or a movie.

I will describe what I remember and maybe you can help me out with a title or what the hell it was :)

Plot (What I can remember):

A group of people (I think they are movie makers) go to this town that is full of (i cannot remember if they are cannibals, vampires or ghouls).

Anyway these people eventually start to kill these people off.

However a couple or maybe just one guy gets away and somehow makes it back to the highway and flags down a cop car.
The cops ask him to escort him back to the town. When they get back to this town the cops turn around in their seats and say something to the guy and then attack him.

I believe that the townspeople cannot leave town but the cops that picked this guy up are a special kind that can walk on the outside.

Well thats it.

I know there isn't much to work with but maybe someone will know what I am blabbing about :)

THX,