Overturned wooden railcars, piles of twisted scrap metal and other debris are being cleared from the site of a train derailment northeast of Montreal, while investigators from the Transportation Safety Board of Canada are inspecting the scene.

The cause of the derailment of the Canadian National Railway Company (CN) train on Sunday afternoon in Repentigny’s Le Gardeur sector has not yet been determined.

In a statement, the TSB said it would “gather information and assess the occurrence.”