Tragedy at Virginia Tech: Campuses seek faster warnings

The two hours it took for Virginia Tech officials to e-mail students a warning about a gunman on campus has raised concern about how schools can get critical news out faster in a crisis. Some universities are devising more targeted means of security in hopes of quickening their responses. At the University of California, an extreme emergency would warrant, among other things, a siren on an outdoor public address system followed by an announcement with instructions.

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