Police are investigating after a fire destroyed two boats at Rosslyn Bay Harbour overnight, and damaged three others.
Around 9pm police were called after reports of a police vessel on fire.
Upon arrival they discovered a different vessel, moored on the opposite side on the pontoon from the police vessel, was alight and drifting.
A second vehicle was also well alight.
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A Queensland Fire and Rescue Service spokesperson said they found two boats and one walkway on fire upon arrival.
By 10pm they said the two boats were completely destroyed.
A water police vessel, another commercial vessel and a private yacht sustained heat damage.
No one was injured in the fires.
Freedom Fast Cats own one of the vessels, and they issued a statement on their Facebook page early this morning.
"As you all may already be well aware, Freedom Flyer caught fire last night," it said.
"No new information has been revealed as to what circumstances resulted in this tragic outcome.
"We wish to advise you that the ferry to Great Keppel Island will still be running today and during the school holidays."
The cause of the fires are yet to be determined, and police have declared a crime scene around the area.
Police are reportedly searching for a dark purple XR8 Ford in connection with the fire.
They are asking for anyone in the area who may have seen anything suspicious to contact Crime Stoppers on 1800 333 000.