Sources: Malheur data breach concerns Fish & Wildlife Gallery 1

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A man stands guard after members of the "3% of Idaho" group along with several other organizations arrived at the Malheur National Wildlife Refuge. (KOIN)

An overview of the location of the Malheur National Wildlife Refuge (KOIN)

Ammon Bundy speaks to reporters during a news conference at Malheur National Wildlife Refuge after meeting with Harney County Sheriff David Ward Thursday, Jan. 7, 2016, near Burns, Ore. (AP Photo/Rick Bowmer)

Ryan Bundy, one of the sons of Nevada rancher Cliven Bundy, walks to a news conference at Malheur National Wildlife Refuge Thursday, Jan. 7, 2016, near Burns, Ore. (AP Photo/Rick Bowmer)

Jon Ritzheimer, a gun ownership activist and a self-described extremist, at the Malheur National Wildlife Refuge, Jan. 7, 2016 (KOIN)