The London Cycling Campaign has released a design for a lorry for urban roads which they say would be safer for cyclists. The design has larger windows and a lower seat so drivers can see cyclists more easily. Half of all cycling deaths in London involve lorries.
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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.