 As the scope and relevance of the shootings quickly became apparent, the four leading broadcast networks in the United States — ABC, CBS, NBC, and Fox — pre-empted regular programming (whether across a network or on its local stations) for breaking news bulletin coverage.This lasted for much of the early afternoon.The local news networks in the Middle Atlantic region had extensive coverage, as many residents of the area had ties to Virginia Tech, until the evening news programs took over at 6