WASHINGTON (Sept. 24, 2019) — Aerial view of a burned-out home impacted by the Sept. 13, 2018 natural gas explosion and fire in Merrimack Valley, Massachusetts. The photo taken on Sept. 13, 2018 was captured by a drone operated by an NTSB investigator to document the damaged caused by the explosions and fires.  (NTSB photo)
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/68618467@N03">National Transportation Safety Board</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/ntsb/48787740283/">PLD18MR003-fig03</a>