President Obama offered sympathy and hope to the victim's families.
"Those we lost live on in us, in the families who love them still, in the friends who remember them always and in a nation that will honor them now and forever," Mr. Obama said.
"In the years to come the 9/11 memorial museum will take it's place along side the fields of Gettysburg, the waters of Pearl Harbor and the Vietnam Memorial," former New York Mayor Michael Bloomberg remarked.
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