Posted by Sarah Harlan - email 

ORLANDO, FL (NBC) - A worker at Disney World in Orlando was killed after the fireworks show there in an accident on the monorail.  

The monorail system inside the Magic Kingdom is closed Sunday night as investigators look into what caused that fatal accident Sunday morning.

Officials said two of the monorails collided, killing the operator of one of the trains.

The operator of the other train was not injured, but was taken to a local hospital.

Five guests were also treated at the scene for minor injuries.