Scotland Yard said they were treating the toddler's death as non-suspicious and that a post-mortem examination was due to take place to establish how the little girl died.
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The robbers casually approached their victim on a busy high street before before spraying a noxious substance in his face.
Tencho Hristov ignored warnings and got trapped between barriers at Roydon in Essex.
The 6km bike track will include 130m of the South Circular near Kew Bridge.