Plumes of smoke were visible from Tiverton, and when I snapped the picture here (click to enlarge) from Mitchell Road at about 7pm, it looked as if the whole length of the pier at the marine terminal was on fire. There was also a boat, several hundred yards northeast of the the pier that was also on fire.

Google Map satellite view

Update: ProJo has the story and Channel 6 was on the scene with a crew.