Who approves the official statements, who provides the information to the public, how are rumors controlled, and what are the three basic categories of public information (explain each)?

Before, during, and after a natural or manmade disaster, authorities must keep the public informed to save lives and property. Please provide a thorough explanation regarding the dissemination of information. Who approves the official statements, who provides the information to the public, how are rumors controlled, and what are the three basic categories of public information (explain each)? Please include a discussion pertaining to obstacles that might hamper the distribution of information to the public.

(This is a discussion post in a local response to terrorism and disaster class, no cover page needed)

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