Police are seeking public assistance to locate a mother and her four-year-old twin daughters.

The three were last seen at about 10.30 am in Rockingham and police believe they may have travelled to Perth.

Concerns are held for their safety and wellbeing.

Anyone with information on the whereabouts of De Arne Terese Hill and her daughters Kyra and Ashleigh Preston-Hill is asked to call Police immediately on 131 444.