In case of high impact crisis, such as earthquake, fire, and
wild animal lose, control center officer should be able to
announce to citizens in the surrounding area as soon as
possible. The citizens can have time to prepare, response, or
adjust themselves according to the announcement. The
announcement should include information such as the
occurring event, effected locations, evacuation plan, contacts
of response teams for help, tip and hint when encounter the
situation, and level of emergencies [21].