A fire ripped through a New York City strip mall early Thursday and triggered a massive backdraft explosion. Seven firefighters and five others were injured and the cause is under investigation. | NBC Nightly News with Tom Llamas

Fire behaviour: Backdraft • In this backdraft demonstration video via @strongthing_strongerfringe you see a slow motion backdraft recorded at FSC Moreton. It allows you get a greater perspective this fire phenomena. • As oxygen is re-introduced to the under ventilated fire it’s able to burn more efficiently again. You see the violent, turbulent smoke being expelled under pressure from all gaps before igniting it’s way along the unburnt products of combustion with explosive force. • From @ukfirem