Three people died and seven more were injured after a shooting at a wood-processing factory in Switzerland, police said.
It is believed the gunman is among the three dead.
More top news
The band announced at a free concert on Friday that they would take over the event's Pyramid stage on Saturday June 25.
The victims were collecting permits and escorts a day after their home town was liberated from the extremists.
Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.