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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Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.
The family of Oliver Dearlove urged people to "think again" before using their fists, as the man who killed him began a six-year jail term.
London Fire Brigade took Southwark Council to court on four charges in relation to safety breaches at Lakanal House in Camberwell.