Local police are hunting some vandals who threw street art into the estuary during the Stretch Arts Festival in Mandurah over the weekend.
One piece of artwork, which was part of the Drift Installation Art Award, was found by event staff in the water on Saturday morning.
They believe it was deliberately thrown into the estuary on Friday night, while a second piece of artwork was also damaged.
Police say the item was retrieved but was "in a bit of a state".
On Saturday night another art piece worth $19,500 was damaged.
According to police, two teenagers were seen running away from the scene by security.
One male is described as in his teens, with fair skin, about 177cm tall, with blonde hair and was wearing blue shorts and a white t-shirt.
The second male is described as in his teens, with fair skin, 167cm tall with a slim build and was wearing a black t-shirt and black pants.
Anyone with information is asked to contact Mandurah Police on 9581 0222 or Crime Stoppers on 1800 333 000.
Unfortunately some uncreative people took it upon themselves to roll some of the street art into the marina overnight. Know anything? 131444 https://t.co/bXrdRr955t
— Mandurah Police (@MandurahPol) May 6, 2017
Perth to Bunbury train service returns
Missing woman found safe and well
Community fed up with teenage hoons terrorising Halls Head oval
Southern suburbs electrician claims $1.8 million Lotto win
Works continue on Pinjarra's Munday Avenue extension
Halls Head support worker charged with historic child sex offences
Severe thunderstorm warning cancelled for Mandurah, Bunbury
Fortnightly red bin collections to remain in the City of Rockingham after council rejects motion
Rate rises on the way for Rockingham, Mandurah ratepayers