One of Richard Stark's Parker novels might have inspired this...
The plot of DAY OF THE WOLVES, in which a robbery team isolates a small town and attempts to rob it clean before outside help can arrive, is quite similar to that of Richard Stark's novel, "The Score," which was published in 1964. It was one of a series of novels devoted to heist expert Parker. Several novels in the series have been turned into movies, with POINT BLANK (1967) and THE OUTFIT (1973) being the best of them. It's not to hard to consider that the writer of DAY OF THE WOLVES read "The Score" and decided to make a movie based on its premise, but changed the characters and details of the robbery enough to avoid a plagiarism claim. Plus, the film had so little of a release that if Stark and his team had ever even heard of it, they would have realized that any lawsuit would bring more publicity to the film and its makers than they deserved.
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