Concord, Knox County (WVLT) - TWRA is investigating a house boat fire at Fort Loudoun Lake.
Just before 6:00 p.m. Friday Rural Metro firefighters responded to the fire, but say it was fully engulfed and they could do little to save the vessel.
They say the house boat quickly sank into the lake.
A Rural Metro spokesperson says they believe it was an engine fire.
Bystanders were able to rescue the people from the boat. No one was injured.