Law enforcement hovering above the Dakota Access Pipeline protests in a helicopter shot down a drone being flown by protesters.

The incident comes just one day after 80+ protesters were arrested and were confronted with mace.

In a press release issued by the Morton County Sheriff's Office, they claim the drone flew at the helicopter, "in a threatening manner" and that passengers on board "feared for their lives."

The sheriff's office also said that two other arrests have been made previously related to the illegal use of drones from protesters.

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