A truck has burst into flames on the Princes Freeway just before the Duncans Road exit in Werribee heading city-bound.

Caller Ray alerted Tom Elliott to the news.

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Two Werribee CFA units alongside Fire Rescue Victoria responded to the reports of the fire at around 9:20am.

Victoria Police were called to the scene with the incident deemed under control at 9:37am and safe at 9:57am.

Image: Supplied