Neighbours have been speaking to ITV News, following the death of three-year-old Olivia Uffindell yesterday.
It's believed she died after her buggy was blown into the path of a van in Croydon.
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The Metropolitan Police said the building material was found in the force's former training facilities.
The toddler was seriously injured when one of the cars rolled and trapped him between the vehicles in a private car park
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