The ceremony, which can be watched online, was scheduled to begin at 8:46 a.m. EDT, the time when the first plane struck the north tower in 2001, and last more than three hours. In ceremonies in past years, the names of the victims of the attacks were read aloud by family members.
A separate ceremony is scheduled to take place at the Pentagon on Wednesday, with President
Although the Sept. 11 museum has yet to open, the memorial portion of the site has been open since 2011. The museum is expected to open its doors to the public in the spring of 2014.
Funding for the museum has been a contested subject in recent years. Federal financing for it has stalled and the memorial foundation has had to raise money for what is expected to be $60 million in annual operating expenses.
On Sunday, CBS' 60 Minutes rebroadcast a segment about the curatorial mission of the museum and the many challenges it faces as it prepares to open.