Police are seeking information after a naked man confronted two young girls on a beach track near Gnarabup last night.
The girls, aged 11 and 13 years old, were walking home alone near Narda Avenue in Prevelly when they saw the man 10m off the track.
He allegedly confronted the girls and committed an indecent act.
He was described as above 160cm with dark hair and clean shaven with a medium build.
Margaret River Police Senior Constable Jeromy Jones said parents had to be mindful of beach safety in the summer months.
“If children are unsupervised, parents want to put measures in place so they are safe,” he said.
Anyone with information was asked to call 9757 2222 or Crimestoppers on 1800 333 000.