The FIA said the circuit was not in its 'licensed configuration' when the incident occurred, and that it was investigating the circumstances leading to the collision and how a similar incident could be avoided in the future.
Autosport understands this was launched immediately after the crash on the Saturday morning of the meeting.
A statement from the FIA read: "During practice for the WTCC round in Vila Real last weekend, Tom Coronel's car suffered a mechanical failure that saw his car leave the track, and ultimately make contact with another vehicle outside the confines of the race track.
"This result was due to the fact that the track was not in its licensed configuration at the time of the incident.
"Corrective actions were immediately implemented for the remainder of running at the Vila Real circuit.
"A more detailed analysis is being undertaken as all involved work to understand how to improve procedures in order to prevent any re-occurrences in future."
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