Arlington police Lt. Christopher Cook said investigators are still trying to understand the series of events that began early Thursday east of Dallas.
He said the woman was shot by a man believed to be her husband but that she was able to text 911 and provide a vehicle description, leading to a police chase lasting about two hours.
Cook said it appears the man driving the RV released the children after police forced the vehicle to stop.
He said a short time later the man shot himself and the RV was consumed by flames, leading to the closure of Interstate 30.
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