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.
More top news
Hurricane Maria is currently pummelling Puerto Rico with 155mph winds after already leaving at least nine people dead in the Caribbean.
Two men have been seriously injured after a gas explosion on an industrial estate.
The two top figures in the far-right group have been charged over leaflets and videos distributed in May.