AUSTIN (KXAN)-- Several first responders responded to a two-story home in northwest Austin that sustained damage after an explosion was heard by multiple callers as far as Cedar Park, Leander, and Georgetown. RELATED COVERAGE: 6 injured after house explosion in northwest Austin, cause under investigation Rubble pile after house collapse in NW Austin (KXAN viewer photo)(Credit: James Collier)(Credit: James Collier)(Credit: James Collier)(Credit: James Collier)(Credit: James Collier)(Credit: James Collier)(Credit: James Collier)(Credit: James Collier)(Credit: James Collier)(Credit: James Collier)(Credit: James Collier)Traffic back-up near house collapse in NW Austin (KXAN photo/Christian Rodriguez-Panesso)(KXAN viewer photo)First responders near house collapse in NW Austin (KXAN photo/Christian Rodriguez-Panesso)First responders near house collapse in NW Austin (KXAN photo/Christian Rodriguez-Panesso)Area near house collapse in NW Austin (KXAN photo/Christian Rodriguez-Panesso)First responders near house collapse in NW Austin (KXAN photo/Christian Rodriguez-Panesso) The incident happened at the 10400 block of Double Spur Loop. Officials say a total of six were injured in the collapse, and there is currently no information on what caused the explosion. ...read more read less