A driver has ben arrested following an early morning crash in Mandurah.
Police say a white Range Rover collided with a grey Honda Odyssey at the intersection of Allnutt Street and Mandurah Road about 3.40am on Friday.
The driver of the Range Rover, a 42-year-old man, suffered minor injuries and was taken into custody.
The driver of the Honda, a 73-year-old man, sustained serious injuries and was taken to Royal Perth Hospital by ambulance.
It is unclear why one of the drivers was arrested, but police say they are continuing to investigate the circumstances surrounding the crash.

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