Americans on Tuesday remembered nearly 3000 victims of terrorist attacks on New York and Washington six year ago at day-long ceremonies which included prayers and concerts in the memory of those killed.
The ceremonies, held under the grim backdrop of gray skies, were more muted than in past years as a new message purported to be from Bin Laden was released to coincide with the anniversary.
In New York, for the first time the main ceremony was held away from the World Trade Center site known as Ground Zero because of construction there.
Those taking part have gathered at a nearby park instead, to a backdrop of bagpipes, drum beats and overcast skies.
Initially, the relatives of the victims vociferously protested when the decision to hold the ceremony in the park opposite to the ground zero was made known.
The city administration however agreed to allow them to go in a single file to the footsteps to pay homage to their loved ones and lay flowers at the site.
But this is the last year they would be able to do so as the structure is expected to start coming up next year.
Church bells tolled and there was a minute's pause in ceremonies at 0846 (local time) when the hijacked plane was flown into the first tower and at 0903 hours when its twin was hit.
The names of all victims were read out during the four-hour ceremony. But unlike the previous years when relatives came up to read the names, this year it was done by first responders and others who came to help.
Thousands of relatives of the victims carrying flowers and photos of their loved ones killed in the attacks assembled in the park to participate in the ceremony.