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Two 17-year-old boys were badly injured when the off-road motorcycles they were riding collided in Kwinana Beach overnight.

A police spokeswoman said the crash happened on a track on a private property near the intersection of Mandurah and Wellard roads about 12.30am.

One of the teenagers was flown to Royal Perth Hospital in the RAC rescue helicopter, while the other was taken to RPH in an ambulance.

The spokeswoman said the teenagers' injuries were not life-threatening.