A bushfire in Port Kennedy that took firefighters two days to battle has been deemed suspicious.
The fire broke out in the Port Kennedy Scientific Park Nature Reserve just before 10pm on Monday.
It took fire crews hours to contain the blaze.
The fire then flared up again on Tuesday morning, prompting another massive response from firefighters on the ground and in the air.
It is now contained and under control.
A bushfire advice remains in place for residents in an area bounded by Port Kennedy Drive, Warnbro Sound Avenue and Secret Harbour Boulevard.
People are asked to report any suspicious behaviour to Crime Stoppers on 1800 333 000.

Digital drivers' licences to be introduced in WA
Mandurah FIFO worker wins $250k
2026 ANZAC Day services across the Peel and Rockingham regions
Mother of 11-year-old boy killed in Mandurah scooter crash found safe and well
Peel charity desperately seeks funds to keep doors open
Australind train service set to resume
Thunder premiership player Traye Bennell hangs up the boots
Works underway to protect 200-year-old 'Big Tree' in Greenfields
Wanted man believed to be in Mandurah area