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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Ursula Keogh, 11, went missing on Monday around 3.30pm. She was dressed in her school uniform.
"My sincerest apologies to everyone who purchased tickets and were planning to come to the upcoming shows."
His comments at the Defence and Security Forum on Monday came after a £20 billion black hole in the budget for the next decade emerged.