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Spokesmen for Mr. Christie and Mr. Cuomo said the governors were fine with the memorial organizers’ decision.

In other 9/11-related news:

The federal government on Monday added about 50 types of cancer to the list of Sept. 11 World Trade Center-related illnesses that will be covered by a program to pay for health coverage.

The National Institute for Occupational Safety, which announced the change, said last June that it favored the expansion of the existing $4.3 billion Sept. 11 health program. That move followed years of lobbying by construction workers, firefighters, police officers, office cleaners and others who fell ill in the decade after the terror attack, which destroyed the 110-story twin towers, spewing toxic dust.

Defense Secretary Leon E. Panetta, who spoke Monday at the Flight 93 National Memorial in western Pennsylvania, said the Shanksville-area field “is the final resting place of American patriots.” Mr. Panetta visited the memorial Monday for the first time, paying his respects to the 40 passengers and crew members who died during the terrorist attacks on Sept. 11, 2001.