ABC, which on Monday ran an extended World News with limited commercial interruption, will continue its coverage of the shootings at Virginia Tech, the deadliest shooting rampage in American history, tonight with an hourlong edition of Nightline, originating from Blacksburg, Virginia. Then, on Tuesday's Good Morning America, Robin Roberts and Chris Cuomo will anchor from Blacksburg, and David Muir will report from the Virginia Tech campus. Charles Gibson will anchor Tuesday's World News from Blacksburg, an area he covered as a reporter earlier in his career.