Emergency services are responding to an incident in the Perth suburb of Canning Vale where five people have been injured.
An area around Eucalyptus Boulevard has been closed off while police investigate.
There are unconfirmed reports that a car may have been involved.
The five people have been taken to Royal Perth and Fiona Stanley hospitals, two of them as priority cases.
St John Ambulance said the incident was reported to them at 4:20pm.
They said it was a police incident and that they could not comment any further.
Police said no further details were available.