Richard Brandon, who works on board the Met's helicopter, says lasers being shone into cockpits are "incredibly distracting". However, their helicopter does have new equipment to identify where the laser is coming from.
More top news
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.