The U.S. Department of Homeland Security encourages businesses to Connect, Plan, Train, and Report. "Applying these four steps in advance of an incident or attack can help better prepare businesses and their employees to proactively think about the role they play in the safety and security of their businesses and communities."
Other Business Resources
Ready Business http://www.ready.gov/business
Prepare My Business for an Emergency with DHS http://www.dhs.gov/how-do-i/prepare-my-business-emergency
Critical Infrastructure Security Information http://www.dhs.gov/critical-infrastructure