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N.D. (AP) — The National Transportation Safety Board will soon release the cause of a 2013 oil train derailment in eastern North Dakota.

The accident happened when a train carrying soybeans derailed in front of an oil tanker train near the small town of Casselton. It caused a series of explosions and the evacuation of hundreds of Casselton residents. No injuries were reported.

The incident contributed to a national discussion about the safety of moving oil by train.

NTSB investigators posted hundreds of pages of records on the derailment in 2015 and noted a broken train axle was found, but it wasn’t pinpointed as a cause.

NTSB spokesman Eric Weiss says the results of the investigation should be released when the board meets next Tuesday.