DHS-FBI Indicators and Protective Measures In Light of Boston Marathon Explosions
Given these events, we are providing indicators and protective measures to aid law enforcement and first responders in identifying and mitigating potential threats. Each indicator listed below may be by itself, lawful conduct or behavior and may also constitute the exercise of rights guaranteed by the US Constitution. In addition, there may be a wholly innocent explanation for conduct or behavior that appears suspicious in nature. For this reason, no single indicator should be the sole basis for law enforcement action. The totality of behavioral indicators and other relevant circumstances should be evaluated when considering any law enforcement response or action.
Possible indicators of pre-operational surveillance or attack planning include:
— Unusual or prolonged interest in or attempts to gain sensitive information about security measures of personnel, entry points, peak days and hours of operation, and access controls such as alarms or locks;
— Observation of security reaction drills or procedures; multiple false alarms or fictitious emergency calls to same locations or similar venues;
— Discreet use of cameras or video recorders, sketching, or note-taking consistent with pre-operational surveillance;
— Interest in speaking with building maintenance personnel;
— Observation of or questions about facility security measures, to include barriers, restricted areas, cameras, and intrusion detection systems;
— Observations of or questions about facility air conditioning, heating, and ventilation systems;
— Suspicious purchases of items that could be used to construct an explosive device, including hydrogen peroxide, acetone, gasoline, propane, or fertilizer;
— Suspicious activities in storage facilities or other areas that could be used to construct an explosive device; and
— Attempted or unauthorized access to rooftops or other potentially sensitive areas.
http://publicintelligence.net/dhs-fbi-boston-marathon-indicators/
