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.
Pop-up ice skating rink glides back into Mandurah for winter school holidays
School holiday fun returns to Mandurah this winter from July 3 to 19.
Federal opposition leader Angus Taylor sits down with local business owners in Mandurah
Federal opposition leader Angus Taylor visited Mandurah this week.
Police search for missing man last seen leaving Rockingham Hospital
Rockingham Police hold welfare concerns for a missing 64-year-old man.
West Aussies urged to be on high alert after surge in winter house fires
Western Australians are being urged to be on high alert this winter after a surge in house fires linked to common household items.
New $3.4 million boardwalk to be constructed at Lake Clifton thrombolites
A new $3.4 million, 145 metre timber boardwalk is set to be constructed in Lake Clifton allowing visitors to get a better view of the world famous thrombolites while also protecting the surrounding fragile ecosystem.
City of Mandurah rolls out new tactile bin lids, accessibility stickers to support residents with low vision
The City of Mandurah has rolled out a new kerbside bin initiative designed to make waste services more accessible.
Driver dies in hospital after Australind crash
A driver has died in hospital 11 days after a serious crash in Australind.
Welfare concerns for woman with dementia last seen in Cooloongup
WA Police have welfare concerns for a missing 74-year-old woman.
Charges laid over fatal West Coolup crash
A 54-year-old man has been charged over a fatal crash in West Coolup, south of Mandurah.
