Four children and three adults have been found dead at a home in rural Western Australia.
He said two firearms were found at the scene and confirmed that at least some of the victims suffered gunshot wounds.
"I can only say at this point in time, we have no information to raise concern about wider public safety issues at this point in time".
Dawson described the incident as a "tragedy" and "horrific incident".
"Police arrived at the property following a call from "'male person' connected to the property" shortly after 5:00 a.m. local time (5 p.m. Thursday ET), national broadcaster ABC reported.
The ages of the children were not released.
The commissioner said the police chaplain had been called to attend the scene of the tragedy to support the emergency services.
It's understood three generations of the same farming family were involved in the tragedy at Osmington, northeast of Margaret River.
"This will be a very large scale and detailed investigation". Dawson said those killed are believed to have been residents at the property.
Other members of the families are in the process of being located.