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The 10:30 a.m. siren, recognized by its distinctive 'pulse tone,' is designed to alert the university community about potentially dangerous non-weather-related threats (e.g., an active shooter situation, bomb threat, hazardous material spill, etc.)  Students, faculty and staff hearing this tone (outside of a testing period -- 10:30 a.m. the first Tuesday of each month) should check their EIU-assigned e-mail accounts and/or EIU's Web site (www.eiu.edu) for important information.  Details concerning the emergency will be posted/updated as soon as they become available.