The Investigative Arm of the National Park Service


The special agents of the National Park Service Investigative Services Branch (ISB) are a specialized and highly trained team of criminal investigators. They work year-round and around the clock to investigate complex, sensitive, and long-term cases of all types of crimes. ISB special agents are stationed across America's more than 420 national parks and report directly to NPS headquarters in Washington, D.C.

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A special agent of the NPS Investigative Services Branch stands at a forested overlook above a river

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See something suspicious? Stay safe and tell us about it. You don't have to tell us who you are, but please tell us what you know.

Find out more about the NPS Investigative Services Branch

What We Do

We investigate complex, sensitive, and/or long-term cases of all types of crimes

ISB Special Agents respond across the National Park System. NPS photo by ISB.

News and Updates

Get the latest case updates and other news from the NPS Investigative Services Branch

Cold cases include missing persons and unsolved incidents. NPS image.

Cold Cases

Cold cases include missing persons and unsolved incidents - do you have information that could help investigators?

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