Depending upon the story being followed , the report may last only a few minutes , or continue for multiple hours – or with the longest uninterrupted news events , four days – at a time ( events in which the latter instances has occurred include the assassination of John F. Kennedy and the September 11 attacks , which took place between November 22 – 26 , 1963 and September 11 – 15 , 2001 , respectively ) . If coverage continues for an extended amount of time , the network may integrate analysis about the story through analysts in-studio , via phone , satellite , broadband ( B-GAN ) or through other means of communication . Depending on the severity of the event , regular commercial advertising may be completely suspended for sustained coverage , and network affiliates will be required to insert their station identification in at the top of the hour overlaid during the report rather than through the usual means of a station imaging promo or program reminder . If a story occurs during the early fringe timeslot and depending on the magnitude of the events at hand , local stations might be given the opportunity to break away from the network feed and begin their evening newscasts . This is set up by a cue from the network 's talent that they will pause for a few seconds to reset coverage , at which point an opening graphic may be rolled again . Information is also disseminated from an internal alert service utilized by a station 's master control . After the local newscast , stations will likely return to the network 's feed as they normally would for the network newscast , but they may be joining in on an " extended edition " . Whether or not a station will take over for local news is usually the choice of that station 's news director
September 11 attacks
September 11 attacks
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