An inquiry has reportedly been opened in France to determine if 12-year-old Jessica Lawson's death was "simply an accident" or not.
The youngster was on a school trip when she died in what has been described as a "swimming incident".
Mehdi Razine, a worker at the activity centre where the tragedy happened, said he saw a plastic pontoon on the lake flip over.
"There was a girl who suffered a nasty blow as it turned and she fell into the water."
French journalist Julien Balidas told ITV News Calendar it was a diving board which had collapsed and Jessica "didn't get out".
The other children on the trip are thought to be returning to the UK this afternoon.
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