I need to hear from anyone who was near to the scene of the incident or who witnessed a group of three males acting suspiciously in the Green Street area on Sunday afternoon.
Anyone with information that may assist the investigation should call Newham police on 020 8217 5253.
More top news
The unlicensed events unfolded on Saturday night at Clapham Common and Tooting Bec Common.
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Jonty Bravery, who is mentally ill, has been jailed for 15 years after throwing a six year old boy from the Tate modern balcony.