Do you recognise these males? (Credit: Metropolitan Police)
The victim, aged in his early 30s, was harassed by a group of teenagers as he stood on a balcony in Ilford Hill at 2.15pm on Tuesday, 8 June.
There have been no arrests but officers would like to speak to the two people shown in the CCTV images.
Officers from the East Area Basic Command Unit are investigating.
Any witnesses or anyone with information is asked to call police on 101 or contact them via Twitter @MetCC quoting reference CAD 4641/08Jun.
To give information anonymously, contact Crimestoppers on 0800 555 111.
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