David Cameron visits New York's Ground Zero
David and Samantha Cameron have been shown around New York's Ground Zero by the city's mayor, Michael Bloomberg, on the final day of their official US visit.
The prime minister will also meet relatives of the British victims of the 2001 attacks in New York.
On Wednesday night, Mr Cameron and Barack Obama paid tribute to each other at a star-studded banquet at the White House.
Mark Mardell reports from Washington.
This video contains flash photography.
15 Mar 2012