The BBC reports on perhaps the most unusual remembrance of the events of September 11, 2001 that felled New York’s World Trade Center:
A warship built with steel salvaged from the World Trade Center is set to arrive in New York.
The USS New York is due to sail up the Hudson River as far as Ground Zero, where it will fire a 21-gun salute.
It will be watched by relatives of those killed in the 2001 attacks that destroyed the buildings, along with rescuers and members of the public.
The US Navy is to hold an official commissioning ceremony for the new warship on Saturday.
The New York set off on its maiden voyage from Louisiana, where it was built, nearly three weeks ago.
The bow of the boat contains 7.5 tonnes of melted steel from the fallen buildings.
The ship’s crest includes images of the Twin Towers and features the colours of the city departments that first responded to the terrorist attacks in which nearly 3,000 people died.