Four suspicious grass fires lit in Perth

Four suspicious grass fires have been lit in Perth's southern suburbs.

The arson squad says the fires were lit between 4pm and 4.45pm on Saturday in South Lake at the corner of Berrigan Drive and Elderberry Drive, and in Jandakot at the corner of Lakes Boulevard and Imlah Court, and at two spots on Cutler Road on a verge and at Verde Reserve.

Police believe the fires, which have been extinguished, are related and want to speak to anyone who saw any suspicious people or vehicles in the areas.