Seattle houseboat fire: Massive flames sparked on Lake Union, video shows

A fire erupted on Lake Union in Washington state Friday night. It is not immediately clear what started the fire, which witnesses say affected a building and several boats.

A. Porcia Palo, an employee of a nearby restaurant recorded a video of the massive blaze, which was provided to Fox News Digital by her mother. 

Witnesses said on social media the flame burned a building and several boats.