Dignitaries and war veterans have been at City Hall for it'sannual remembrance service.
Mayor Boris Johnson was among those who laid wreaths to rememberthe capital's war dead.
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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.