Hull City have been promoted to the Premier League following a 2-2 home draw against Cardiff City.
Watford, who started the day in third place in the Championship table, lost at home to Leeds and missed the chance to go up to English football's top division automatically.
Gianfranco Zola's team will now compete in the play-offs at the end of the season.
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Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.
Windy this weekend with gales across northwestern parts of the UK. Rain spreading southeast.
Greater Manchester Police said "inquiries are ongoing to fully understand the circumstances of the incident."