article_snippet: Unknown cause: Investigators are still unsure as to what caused the crash.
article_snippet: There were no skid marks on the road and no signs of mechanical errors in the car .
article_snippet: A neighbor reported hearing a loud noise on late Friday just after the car crash, but when they checked the area around Provo, no cause of sound could be located .
article_snippet: Investigators are still unsure of what caused the crash as there are no skid marks or signs of mechanical failures in just after the car crash.
article_snippet: Police don't suspect drugs or alcohol as a factor but are awaiting toxicology test results.