About 6.40pm last night, police were called to a disturbance outside basketball courts located on Pinjarra Road in Mandurah.
On arrival police located approximately 60 to 70 people fighting. It is believe the incident stemmed from ongoing issues between two families.
Around 9.30pm, another disturbance involving approximately 15 people linked to previous groups, occurred outside a residence on Duncan Street in Coodanup.
There are no reports of injuries. No arrests have been made at this time and the police investigation into these two incidents is ongoing.
Police would like to speak to anyone who saw the incidents and anyone with information is urged to call Crime Stoppers on 1800 333 000 or report online at www.crimestopperswa.com.au.
Members of the public living or travelling in the area that may have CCTV or dash-cam footage are asked to upload it to https://wapf.au.evidence.com/axon/citizen/public/disorderly-incid-mandurah