A warship built of steel salvaged from the World Trade Center is on its maiden voyage to New York, the city it was named after.
The USS New York embarked on its maiden voyage on Tuesday from Louisiana, where it was built, and is due to arrive in New York harbour on 2 November.
The warship will be welcomed by a formal ceremony to honour those killed in the attacks on 11 September 2001, which destroyed the World Trade Center and killed nearly 3,000 people.
Celebrations end on 7 November with the US Navy's commissioning of the ship.
The BBC reports the bow of the ship contains 7.5 tonnes of melted steel from the fallen buildings.
The ship's crest includes images of the Twin Towers.
The ship was built at Northrop Grumman Shipbuilding's yard in Avondale, Louisiana.
Two other ships, the Arlington and the Somerset, which are still under construction, will join the USS New York as 9/11 tributes.