Two workers have been injured at BP's Kwinana Refinery.
A DFES spokesperson said they received a triple-0 call around 9.30am on Tuesday after reports of a machinery malfunction.
"Emergency services and onsite teams have isolated the incident and it is under control. All people on site have been accounted for. Smoke observed in area is dissipating," a tweet from BP Australia read.
A BP spokesperson said the cause of the incident is "unknown" and an "investigation is underway".
A man in his 60s was taken to Fiona Stanley Hospital with smoke inhalation while another man in his 40s was conveyed to Rockingham Hospital with minor burns.
The families of the men have been notified.
BP confirms that an incident occurred at our Kwinana Refinery (WA) at approximately 9am (WST) this morning. Emergency services are on site. More details to come.
— BP Australia (@BP_Australia) July 30, 2019
Kwinana Refinery update. Two people are being treated for injuries - families have been notified. More to come.
— BP Australia (@BP_Australia) July 30, 2019
Mandurah Crab Fest boasts huge range of free, family friendly entertainment
Fuel prices surge in Perth, Mandurah
Teen boys charged over Mandurah burglaries
Tragic update in search for missing man Robert Snyder
Premier Roger Cook to leave Kwinana electorate, move to Perth
Mandurah Marine Rescue's new vessel named in memory of nun who survived 1959 boating accident
Teen dies in motorbike crash at Waroona Dam
Shark alert issued after whale carcass reported at Preston Beach
Kwinana businesses to refuse serving students during school hours