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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A judge ruled the boy may be allowed home from Alder Hey Children’s Hospital, but will not be allowed to go to Rome for further treatment.
Alek Minassian, 25, has been charged with first degree murder.
The president, meanwhile, thanked the French leader for his “steadfast partnership” in the recent missile strike in Syria.