(Portland, OR) -- An investigation is ongoing into a fire that destroyed a boat at North Portland Harbor. The fire was reported around 3 o'clock yesterday morning and was burning in a boat that was about 40 feet long. No injuries were reported. Firefighters had to use chemical extinguishers to put out fuel that was burning in the stern of the boat. Booms were used to contain oil, fuel, and other chemicals. The cause of the fire remains under investigation.