Erie Police Chief Dan Spizarny said Friday that investigators suspect that at least some incidents in a recent spate of gun violence in the city might stem from the fatal shooting of a 13-year-old boy in early December. Those incidents could include reports from two teenage boys who said they were shot at by unknown suspects as they walked in neighborhoods on the city's east side on Thursday night. Neither teen was injured in the two shootings, which were reported about an hour apart. Erie police had no suspects in either crime Friday. Authorities said they are investigating whether the teens were targeted in the incidents.