Humberside Fire and Rescue Service has tweeted its "thoughts and prayers" for the families of the five people, including three children, who lost their lives in a house fire in Sheffield.
Shocking news of the five people who lost their lives in a Sheffield house fire overnight. Thoughts and prayers with the families. @syfr
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.