Photo: Rachel Sigur/St. Bernard Parish Government
The St. Bernard Parish Sheriff's Office is investigating whether criminal activity caused an oil spill at an Entergy substation in Chalmette.
An Entergy spokesperson said valves to two oil-filled transformers were removed a day or two before the leak was discovered on Sunday.
About 20,000 gallons of oil leaked into a nearby waterway and the marsh of Bayou Bienvenue.
Entergy says the oil sheen is contained in a floating containment boom.
The company says the substation was de-energized after a tornado hit the area in March.
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