UPDATE: Alexander has been located safe in bushland off Kingsbury Drive.
Police are asking for the public's help to find a 33-year-old man last seen in the Karnup area in the last 24 hours.
Alexander Doherty is described as 175cm tall, with a medium build and brown hair.
He was last seen wearing a white long-sleeved shirt, dark coloured track pants and a black hat.
Concerns are held for his welfare and anyone who sees Mr Doherty is asked to call police immediately on 131 444.