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Traffic is blocked in Perth's south after a factory fire this afternoon.

Seven fire crews were called to contain the fire which started in an O'Connor factory at about 2pm. The building is believed to have been used by a galvanised steel company.

A Fire and Emergency Services Authority spokeswoman said the fire was contained at 2.18pm.

Nobody was injured in the fire and the cause of the blaze has yet to be determined.

Sainsbury Road between Hines Road and Stock Road is closed until further notice.

Police have urged motorists to avoid the area.