This is part of a nine.msn report.-http://news.ninemsn.com.au/article.aspx?id=642949
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The Australian Transport Safety Bureau (ATSB) said the aircraft had experienced a "sudden in-flight upset" while cruising in "level flight".
It said most of the injured were travelling in the rear of the aircraft.
"The crew declared a mayday and diverted the aircraft to Learmonth, near Exmouth in WA, where it landed without further incident," the ATSB said in a statement.
The ATSB had initiated a safety investigation and was making arrangements for investigators to travel to Learmonth as soon as possible, it said.
ATSB spokesman Ian Sangston said as many as 30 people were injured and up to 15 people had broken bones as a result of the incident.
"At that stage the pilot declared an emergency and diverted to Learmonth," Mr Sangston said.
Two ATSB investigators were preparing to arrive at Learmonth, near Exmouth about 9pm WST (midnight AEDT) on a chartered aircraft.
Five other investigators will also travel to the airport to investigate the incident."