Arson suspected in $90,000 tug boat fire at Port River The Port River tug boat damaged by a suspicious fire. Picture: Sam Kelton Source: Supplied A FIRE that gutted a tug boat at Port Adelaide overnight has been confirmed as suspicious. Fire cause investigators will today try to determine exactly how the blaze broke out. Just before 2.30am police and fire crews were called to Dock 2 of the Port River system, where a large tug boat was on fire. Did you get any photos of the boat blaze? Share them with us through NewsForce Three fire units attended and extinguished the blaze but not before it caused extensive damage to the boat. Investigators have confirmed the fire was suspicious but have downgraded the earlier damage estimate of $250,000 down to $90,000. The tug boat was slated to be dismantled and sold for scrap. Anyone with information on the fire is asked to contact Crime Stoppers on 1800 333 000 or report online at www.sa.crimestoppers.com.au