National

April 17, 2007 3:00 AM

Campuses use technology to alert people to emergencies

Some universities and cities have set up elaborate voice-mail and e-mail systems to alert people in case of emergencies, such as the massacre at Virginia Tech. The systems take advantage of the spread of cell phones, handheld digital devices and the Internet to swiftly communicate threats, from tornadoes to armed intruders.

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