A SPECIALIST police forensic team has collected evidence from the two fire-damaged vessels that lit up the harbour last Friday morning.

The remnants of the long lining fishing trawler the Kim Ocean and the sunken yacht the Owl and the Pussycat continue to sit cordoned off on the southern wall of the inner harbour.

Marine Area Command is leading the investigation into what caused the "suspicious fire''.

Flames leapt from the wheelhouse of the trawler as it was docked behind the Coffs Harbour Fishermen's Co-op around 3.15am.

Police said the boat's engines started and it broke from its bow line and crashed into the yacht moored nearby.

Running at full throttle, the blazing boat drove the yacht across the harbour before the vessels collided with the break wall. Police have interviewed the trawler's crew including a deckhand who is depicted in security vision as being on board the vessel before the fire started.

"Forensic Services officers have conducted an examination of the scene and a number of witnesses have been spoken to by police," a NSW Police spokesman said.

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