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Tennessee National Guard Black Hawk helicopter crashes into Alabama highway and explodes in huge fireball killing ALL military personnel who were on board.

A Tennessee National Guard UH-60 Black Hawk military helicopter 'exploded' into a huge fireball on an Alabama Highway leaving no survivors, officials say.

The aircraft went down just before 3pm in the median of Highway 53, near Burwell Road, in the town of Harvest about a half hour north-west of Huntsville.

Footage from the scene showed thick, black smoke billowing from the crash site. The fire was quickly extinguished.

Huntsville Emergency Medical Services said there were no survivors. Its unclear where the chopper in question was stationed, who was on board, and how many people died.

The Madison County Sheriff's Office said the helicopter 'exploded on impact and was burning' when firefighters arrived, adding 'It's a pile of rubble.'