The Arson Squad is investigating a deliberately lit fire at the Mandurah Forum.
A Department of Fire and Emergency Services spokesperson said the centre's automatic alarm system was triggered around 12.58am on Friday.
The fire is understood to have started at the back of Kmart.
It was brought under control by 2am.
A damage bill has been estimated at $100,000.
The cause has been deemed as suspicious.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000.
Community invited to name crane towers building new Mandurah Hospital
The community is being invited to name four crane towers that are helping to build the new Mandurah Hospital.
Hundreds of volunteers remove 525kgs of rubbish from Mandurah's waterways
A record number of volunteers have come together to remove over 525kgs of rubbish from Mandurah's waterways at the annual Luca's Legacy Clean-Up.
Port Kennedy man fined $4.2k for failing to feed horse
A Port Kennedy man has been fined $4200 and banned from owning a horse for three years after failing to feed his six-year-old mare, leaving her emaciated.
Rockingham General Hospital patients face the longest waits for elective surgery
Just over half of patients waiting for elective surgery at Rockingham General Hospital received their treatment on time.
Australian-first drone technology to monitor emergencies, crimes in Baldivis, Kwinana, Rockingham
Baldivis, Kwinana and Rockingham will be the first suburbs in WA where drones will be used to give police an extra set of eyes in the sky when responding to crimes and emergencies.
Teen accused of ordering firebomb attack on Baldivis tobacco shop
An 18-year-old man has been charged after allegedly orchestrating a firebomb attack on a Baldivis tobacco shop while he was in Iraq.
City of Mandurah sees sharp rise in animal cruelty reports
The City of Mandurah has recorded a 36.5 per cent jump in animal cruelty reports in the last year financial year.
Geoff Valentine returns to Peel Thunder as senior coach
Peel Thunder has announced the return of Geoff Valentine as senior coach for the next two seasons.
Golden Bay woman charged with lacing colleague's curry lunch with snail poison
A Golden Bay woman has been charged after allegedly putting snail poison in her colleague's curry.