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N.D. (AP) — Documents provided to an online magazine indicate a private security firm hired by the developer of the disputed Dakota Access oil pipeline conducted an aggressive, multifaceted operation that included a close working relationship with public law enforcement.

The Intercept reports the documents show Energy Transfer Partners hired TigerSwan to help with security. The firm was founded by retired military special forces members. The documents show TigerSwan used military-style counter-terrorism measures against what it considered “an ideologically driven insurgency.”

The magazine reports that it obtained documents through leaks and through open records requests.

Native American advocates say the report lends credence to their belief that law enforcement favored private industry in the monthslong dispute. Law enforcement and pipeline developer Energy Transfer Partners say safety was the top priority.