Search for Perth mum enters fourth day

The search for missing Perth mother Robyn Santen, whose car was found at a Perth beach, has entered its fourth day.

The search has been scaled back, with water police pulling out of the search for the 36-year-old, who has not been heard from since Saturday.

Police said the land and air search would continue along the coast, with weather conditions meaning the water contingent won't take part on Thursday.