Passengers and crew have been evacuated from a Virgin plane at Sydney airport following an incident.
The plane, which was set to fly to Adelaide on Thursday morning, left the gate, but did not take off.
There are unconfirmed reports that the plane is grounded because of a bomb threat.
Australian Federal Police (AFP), who attended the scene, told AAP the incident was being treated seriously.
But they were unable to confirm media reports of a bomb threat.
