Detectives have released CCTV footage as they continue to investigate four firebombings in Greenfields and Dudley Park last month.
The first incident happened at a property in Greenfields on Monday, October 6 around 4.40am.
A person threw a firebomb at a ute which then bounced off the car and into the carport.
Resident Penelope Travers ran out of her house to try and douse the flames but a spray paint can blew up in her face leaving her with serious burns.
Penelope Travers suffered serious burns. PIC: 9News
The attackers then returned to the same property around 5.20am on Sunday, October 12 to again set fire to the ute.
Similar car firebombing incidents were also reported in Dudley Park on Friday, October 10 and Friday October 24.
Police believe all four incidents are linked and have released CCTV footage in the hope someone with information comes forward.
Anyone with any information relating to these fires are urged to contact Crime Stoppers online at www.crimestopperswa or by calling 1800 333 000.
Rewards of up to $25,000 are available for information that leads to the identification and conviction of an arsonist.
Community invited to name crane towers building new Mandurah Hospital
Hundreds of volunteers remove 525kgs of rubbish from Mandurah's waterways
Port Kennedy man fined $4.2k for failing to feed horse
Rockingham General Hospital patients face the longest waits for elective surgery
Australian-first drone technology to monitor emergencies, crimes in Baldivis, Kwinana, Rockingham
Teen accused of ordering firebomb attack on Baldivis tobacco shop
City of Mandurah sees sharp rise in animal cruelty reports
Geoff Valentine returns to Peel Thunder as senior coach
Golden Bay woman charged with lacing colleague's curry lunch with snail poison