The alarm in the garage near the parking lot was set off by exhaust from a Gaeta Recycling truck that pulled in around 11 a.m., firefighters told Daily Voice on the scene.
"Something's not set up right," a firefighter said. "Whether they should move the detector or exhaust into a different spot [on the truck]."
One fire truck and one chief's vehicle responded to the scene, along with one police car.
The scene was cleared in less than 30 minutes.
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