Trees planted at 9/11 memorial site
The first trees donated by organisers of the September 11 memorial in New York have been planted at the Flight 93 site in south western Pennsylvania.
The National Park Service called the gift of 40 sweet gum trees a symbol of the ties between the memorials for victims of the September 11 2001, terrorist attacks.
The Daily American said three of the trees were planted in a ceremony at the site near Shanksville. The rest will be planted over the next few weeks.
The trees were initially given by the state of Maryland in 2006 to the World Trade Centre memorial, but were not planted due to a landscape design change.
Forty passengers and crew died after fighting with hijackers aboard the plane, which crashed in a field.