A string of smash-and-grab robberies from vehicles in Southbury may have been committed by one suspect or group of suspects.  Southbury Police say since last Wednesday, at least three unoccupied vehicles had their windows smashed in order to gain entry and steal items left inside.  Police say they aren't ruling out the possibility that some of the incidents may be connected.  The incidents currently under investigation include from parking lots at Community House Park, Bent of the River Audubon Center, and a commercial building on Southford Road.  Witnesses reported a white SUV driving erratically out of the parking lot.  The investigation remains ongoing.