>> are you aware of any other police department that has this extensive technology? >> no. no. you know, people understandably don't see themselves threatened as we do. >> reporter: but there are some things in this nerve center we're not allowed to show you, like the electronic board constantly updating with police alerts about criminal and suspicious activities. some 4,000 cameras around the city stream into this command center. due to security concerns, boston police won't say how many cameras are in their city, but the number is believed to be dwarfed by those in new york. select cameras even send out an automated alarm if a bag is left unattended for several minutes. >> if it looks -- continues to look suspicious, the bomb squad would come in. they would try to x-ray it and if there was still no final determination, they may use a disrupter to -- you know,