It may not be Halloween yet, but a bunch of terrifying clowns have been roaming around Mandurah, scaring the locals.

The clown craze terrorising the United States finally hit Western Australia - and Victoria - this week, with clown groups sprouting across Facebook.

Sinister clowns which have been popping up around the US are now making appearances in Australia.

In groups such as Clown Purge Perth and Perth Clown Attack, allegedly terrifying clowns plot their next appearances and ask residents where would they like them to show up next.

Clown sightings have been reported by Mandurah residents around the eastern foreshore, Mandjar Square and driving along Murdoch Drive in recent days.