There will be a live webcast of the 9/11 anniversary ceremony, which begins at 8:39 a.m. EST.
It is being held at the 9/11 Memorial plaza, where family members of victims of the 2001 and 1993 attacks have been invited to read names.
There will be a moment of silence at 8:46 a.m., marking the time hijacked Flight 11 struck the North Tower.
