A 29-year-old man has been arrested on suspicion of murder, after a woman's body was found in a suitcase in north-west London.
The woman has not yet been formally identified.
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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.