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The communications are seamless. >> reporter: video from police helicopters and more than 100 security cameras all along the 26.2-mile route can be instantly accessed on screens or laptops. the center will help local, state and federal agencies coordinate 3,500 uniformed and plane clothes members of law enforcement. thats double last years number. >> were better prepared, better leaders because of our experience last year. >> reporter: since the attack, the boston police department has invested ...