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Quick review:
Things to Look Out For: Be Observant:
Multiple sightings of the same suspicious person, vehicle or activity at the same location;
Individuals or activities that don't "fit" into the surrounding environment;
Individuals sitting in a parked vehicle for an extended period of time;
Individuals or several people sketching or taking notes, photographing or videotaping areas or buildings not normally associated with tourist activity;
Clothing out of place for the weather, such as someone wearing a heavy coat in hot weather;
Individuals or people carrying unusually heavy bags or backpacks;
Vehicles -- especially vans, U-Hauls or delivery trucks -- improperly parked or parked in locations not normally associated with deliveries;
Follow your instinct. If something doesn't look right, it might not be.