A massive blast at a military explosives facility in Tennessee has left several people dead and others missing, officials say.

At least 19 people are unaccounted for following the explosion, according to a local affiliate of CBS News.

Aerial video from the scene in Hickman, south-west of Nashville, shows charred debris scattered around the area and little remaining of the facility.

The explosion just before 08:00 local time on Friday was heard from miles away including in neighbouring counties, reports say.

There is a huge emergency response at the scene, with one first responder telling the Associated Press they could not enter the site initially due to continuing detonations.

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