An expert who saw footage of a massive fire in a suburban Detroit community wondered what caused the violent blaze. Until he learned that vape pens were at the site. #detroit Thumbnail source: Source: WXYZ Subscribe for more Breaking News: http://smarturl.it/AssociatedPress Website: https://apnews.com Twitter: https://twitter.com/AP Facebook: https://facebook.com/APNews Instagram: https://www.instagram.com/APNews/ ​ This video may be available for archive licensing via https://newsroom.ap.org/home