Lt. Kim Montes says the dead included a 4-year-old girl and her 19-year-old sister from Glenarden, Maryland.
A 37-year-old man from Marlboro, Maryland, was also found dead.
Montes says the van crashed early Sunday near Ormond Beach. The driver apparently drifted off the road, then overcorrected.
The van rolled over, ending up in a ditch. The impact ripped open the roof, ejecting multiple occupants.
Montes says the family and friends were heading home from a trip to Orlando.
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