William Hague told ITV News he has joined Angelina Jolie in tackling sexual violence in conflict because "it is one of the great crimes committed in the modern world."
Speaking ahead of today's Time To Act summit, the Foreign Secretary said: "I think it is getting worse and that it will get even worse over the coming years if we don't now make a stand against this.
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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."