Police are seeking to identify the person responsible for lighting a series of scrub fires in Hamersley last week.
Four fires were lit last Thursday — between 8pm and 8.30pm — along the bike path beside Reid Highway between Erindale and Wanneroo Roads.
A short time later, a fifth fire was lit in bushland on Wanneroo Road in Balcatta near the Water Corp facility.
Fire crews raced to the scene and extinguished the fires before they could impact on homes.
Strike force vulcan officers wish to speak to the person pictured, who was sighted riding an electric bicycle with distinctive large wheels and a large rear tail light.
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Police say the person was in the vicinity of the fires just before they started.
The person is described as being fair-skinned, with a slim build, balding and wearing dark-coloured pants and a top.
Police believe they can assist with this investigation.
Anyone with CCTV, mobile phone, or dash-cam vision of the above areas taken between 8pm and 8.45pm can upload the vision directly to Strike force vulcan investigators via this link: