Protesting firefighters brought proceedings at City Hall to a standstill today, as they confronted Boris Johnson.
Mayor's Question Time had to be halted until order was restored - and all of it was witnessed by children visiting from a primary school in Croydon.
Carolyn Sim reports.
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Police say the victim and her friend were 'disgusted' by what they saw and were left feeling traumatised.
Best of the sunshine in the centre of town mid afternoon but dull and dank for most.
Detectives have released CCTV pictures of two men they are hunting and warned the culprits could have targeted others.