GRASSY BUTTE, N.D. — Officials say a lightning strike caused a contained release of thousands of gallons of oil at a saltwater disposal well in western North Dakota.

The North Dakota Oil and Gas Division says the lightning struck the Cypress Grassy Butte saltwater disposal well about nine miles north of Grassy Butte on Monday night.

Cypress Energy Partners reports nearly 3,200 gallons of oil and about 135,000 gallons of saltwater were contained to the location after lighting struck the site. The lightning also caused a fire that burned up 18 tanks.

Authorities say proper site maintenance also prevented the fire from leaving the site.

A state inspector has been to the location and will monitor the continued cleanup.

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