PROVO, Utah — A string of explosive device discoveries throughout the greater Salt Lake Valley over the past week has alarmed local authorities, prompting increased concern over public safety. Former police chief Chris Bertram emphasized the unusual nature of the incidents, particularly given that they occurred outside of the typical timeframe for such discoveries, such as the months leading up to the Fourth of July. “In the timeframe that we’ve had in the last month, with the number of devices we’ve found, it is always concerning,” Bertram said. Investigations into the three separate incidents are ongoing, but the unusual timing…