Alicia Keys is part of a star-studded line-up that will perform at the 12-12-12 concert in New York
She said: "I was born and raised in New York and I was here during everything that happened with Sandy. It really displaced people and devastated people's whole lives".
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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.