A woman has been rushed to hospital in a critical condition after what is believed to be a workplace incident in High Wycombe.

The woman, aged in her 50s, was taken under priority conditions to Royal Perth Hospital after St John Ambulance paramedics were called to the incident on Eureka Street about 11am.

Early information suggests she has serious injuries after she was trapped in the doors of a small, stationary bus.

Department of Fire and Emergency firefighters were also called to the scene to help free the woman.

Sunrise correspondent Matt Tinney has the details.

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