dr. amy clinger and her daughter amanda started education school safety network over the past six years. they're not surprised to hear about the bomb threats in virginia. >> unfortunately, it's pretty much business as usual. that's what we've been seeing every school day this whole academic year. averaging 8 to 10 bomb threats a day. >> receiving bomb threats by automated image. >> who is responsible? >> i wish i knew that. there's a lot of investigation that needs to take place. >> tonight, there is investigation that some received in new jersey today. officers found nothing and determined the threats aren't credible in both states. >> law enforcement and first responders have a lot of training. >> the schools can't take any chances. >> w oh, okay, maybe nothing's probably going to happen. but the problem is school is in this dilemma of you have to do something. we can't ignore it. it really becomes a really frustrating specious for schools. >> frustrating for schools, frustrating for parents and kids. police urge anyone with information, if you know who is responsible for these bomb th