New figures show a record number of visitors to London so far this year. 7.9 million flocked to the capital in the first six months of 2013, a 7.7% boost on the same period last year.
The figures from the latest International Passenger Survey also reveal 12 times as many tourists visited London as the next most popular UK city, Edinburgh.
More top news
London is the second least affordable city in the UK, while commuter hotspot St Albans has seen the biggest prices rises
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.