But apparently, someone saw the teens carrying toy guns into the building on Centre Street, which is the heart of the town's historical district. When they couldn't get an answer to calls placed inside the building, they assumed the worst.
Police cordoned off the block, cleared nearby buildings and surrounded the post office ready for a hostage crisis. When a group of students left the post office, they were ordered to get on the ground, face down.
Postmaster Ron Steedley had given permission for the school group to use the post office after hours to make a movie, "Rolling Thunder." Steedley said he didn't think the student's movie would frighten anyone.
Devon Menendez, the film's director, said his film career is over.
"I'm not accepting any more offers to direct a movie," he said.