The Maritime Safety Commission has submitted a report in April
"The collapse has been caused by the deterioration of the ship's maneuverability due to external disturbances in relation to the normal anticipated for the vessel. The disturbances have been mainly caused by ice clogging on the starboard side. Due to the reduced visibility and darkness, this ice accumulation has not been observed. The overall impact of the current has enhanced the influence of the ice bank.
The moderate disturbances have also shown that the margins were insufficient due to the small margins found for the maneuvering in the waterway's section.
A contributing cause of the accident is the failure to wait for daylight and / or to use a tugboat since visibility and night darkness have not allowed the opportunity to observe obstacles in the waterway such as ice.
The lack of appropriate and mandatory standards has thus given the preconditions for the accident in the light of the bridge's not known vulnerability. "
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