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FBI is both the Federal Police and Domestic Intelligence Agency. That means a combination of Police and ISD. CIA is has external Intelligence remit and cannot operate locally. NSA handles SIGNIT which is the interception of all signals/comms. For Singapore this is done by DSTA.
correct. it's very territorial here in the u.s. and fbi has federal jurisdiction for certain crimes that cross state boundaries, such as kidnapping, terrorism, wire fraud, inter state serial killing, bank robbery, organized crime, etc. the sg cid is more like a city police department's investigative or detective unit. some states have state level bureau of investigation units responsible for inter city and inter county criminal investigation and enforcement within the state boundary.